The history of Korea stretches from Lower Paleolithic times to the present. The earliest known Korean pottery dates to around 8000 BC, and the Neolithic period began before 6000 BC, followed by the Bronze Age around 2500 BC. According to the Samguk Yusa and other Korean medieval-era records, the Gojoseon (Old Joseon) kingdom was said to be founded in 2333 BC, eventually stretching from the peninsula to much of Manchuria. By 3rd Century BC, it disintegrated into many successor states.
In the early Common Era, the Three Kingdoms (Goguryeo, Silla, and Baekje) conquered other successor states of Gojoseon and came to dominate the peninsula and much of Manchuria. The three kingdoms competed with each other both economically and militarily. Goguryeo and Baekje were more powerful for much of the era, especially Goguryeo, which defeated massive Chinese invasions. Silla's power gradually extended across Korea and it eventually established the first unified state to cover most of Korean peninsula by 676, while former Goguryeo general Dae Jo-yeong founded Balhae as the successor to Goguryeo.
Unified Silla itself fell apart in the late 9th century, giving way to the tumultuous Later Three Kingdoms period (892-936), which ended with the establishment of the Goryeo Dynasty. After the fall of Balhae in 926 to Khitan, much of its people led by the Crown Prince Dae Gwang-hyeon were absorbed into Goryeo.
During the Goryeo period, laws were codified, a civil service system was introduced, and Buddhism flourished. In 993 - 1019 Khitan Liao Dynasty invaded Goryeo and were repelled. In 1238, the Mongolian Empire invaded and after nearly thirty years of war, the two sides signed a peace treaty.
In 1392, the general Yi Seong-gye established the Joseon Dynasty (1392-1910) after a coup. King Sejong the Great (1418-1450) promulgated hangul, the Korean alphabet. Between 1592-1598, Japan invaded Korea, but was eventually repelled with the efforts by the Navy led by Admiral Yi Sun-shin, resistance armies. In the 1620s and 1630s, Joseon suffered invasions by the Manchu Qing Dynasty.
Beginning in the 1870s, Japan began to force Korea out of China's sphere of influence into its own. In 1895, Empress Myeongseong was assassinated by Japanese agents. In 1897, Joseon was renamed the Korean Empire(1897-1910), and King Gojong became Emperor Gojong. Emperor Gojong and Korean independence activist was trying to indepence of korea from the Japanese imperialism.
Nevertheless, In 1905, Japanese forced Korea to sign the Eulsa Treaty making Korea a protectorate, and in 1910 annexed Korea, although neither is considered to be legally valid. Korean resistance to the Japanese occupation was manifested in the massive nonviolent March 1st Movement of 1919. Thereafter the Korean liberation movement, coordinated by the Provisional Government of the Republic of Korea in exile, was largely active in neighboring Manchuria, China and Siberia.
With the defeat of Japan in 1945, the United Nations developed plans for a trusteeship administration by the Soviet Union and the United States, but the plan was soon abandoned. In 1948, new governments were established, the democratic South Korea and Communist North Korea divided at the 38th parallel. The unresolved tensions of the division surfaced in the Korean war of 1950, when North Korea invaded South Korea.
See main article: Prehistoric Korea.
Archaeological evidence shows that hominids first inhabited the Korean Peninsula 700,000 years ago, though some North Koreans claim it may have been inhabited for 1,000,000 years. Tool-making artifacts from the Palaeolithic period (700,000 BC to 40,000 BC) have been found in present-day North Hamgyong, South P'yongan, Gyeonggi, and north and south Chungcheong Provinces. The people were cave dwellers and built homes, using fire for cooking food and warmth. They hunted, gathered and fished with stone tools.
See main article: Jeulmun pottery period.
The earliest known Korean pottery dates back to around 8000 BC. or before, and evidence of Mesolithic Pit-Comb Ware culture or Yungimun Pottery is found throughout the peninsula. An example of a Yungimun-era site is the Gosan-ni in Jeju-do. Jeulmun or Comb-pattern Pottery is found after 7000 BC, and pottery with comb-patterns over the whole vessel is found concentrated at sites in West-central Korea between 3500-2000 BC, a time when a number of settlements such as Amsa-dong(암사동) existed. Jeulmun pottery bears basic design and form similarities to the Jōmon culture in Japan and to that of the Russian Maritime Province, Mongolia, and the Amur and Sungari River basins of Manchuria. 
See main article: Mumun pottery period.
Archaeological evidence demonstrates that agricultural societies and the earliest forms of social-political complexity emerged in the Mumun Pottery Period (c. 1500-300 BC). People in southern Korea adopted intensive dry-field and paddy-field agriculture with a multitude of crops in the Early Mumun Period (1500-850 BC). The first societies led by big-men or chiefs emerged in the Middle Mumun (850-550 BC), and the first ostentatious elite burials can be traced to the Late Mumun (c. 550-300 BC). Bronze production began in the Middle Mumun and became increasingly important in Mumun ceremonial and political society after 700 BC. The Mumun is the first time that villages rose, became large, and then fell: some important examples include Songguk-ri, Daepyeong, and Igeum-dong. The increasing presence of long-distance trade, an increase in local conflicts, and the introduction of bronze and iron metallurgy are trends denoting the end of the Mumun around 300 BC.
See main article: Gojoseon. Gojoseon was the first Korean kingdom. According to the Samguk Yusa and other Korean medieval-era records, Gojoseon was founded in 2333 BC by the legendary Dangun, said to be descended from the Lord of Heaven.
The people of Gojoseon were the descendants of migrating Altaic tribes that settled in Manchuria, far eastern China north of the Yangtze River, and the Korean Peninsula. They are the first direct Korean ancestral line recorded in writing.
It is believed that by the third century BCE, iron culture was developing and the warring states of China pushed refugees eastward and south. Recently however, an iron mirror has been found in Songseok-ri Kangdong-gun Pyongyang in North Korea, that may have originated from 1200 BCE.
Around this time, a state called Jin arose in the southern part of the Korean peninsula. Very little is known about Jin, but it established relations with Han China and exported artifacts to the Yayoi of Japan. A king of Gija Joseon may have fled to Jin after a coup by Wiman. Jin later evolved into the Samhan confederacies.
The course of the decline and fall of Gojoseon is in dispute, depending on how historians view Gija Joseon. The theory suggested by Joseon Sangosa is that Gojoseon disintegrated by about 300 BCE as it gradually lost the control of its former fiefs. Many smaller states sprang from the former territory of Gojoseon such as Buyeo, Okjeo, Dongye, Guda-guk, Galsa-guk, Gaema-guk, and Hangin-guk. Goguryeo and Baekje descended from Buyeo. The Three Kingdoms refer to Goguryeo, Baekje, and Silla, although Buyeo and the Gaya confederacy existed into 5th and 6th centuries respectively.
See main article: Proto-Three Kingdoms of Korea. The Proto-Three Kingdoms period, sometimes called the Several States Period (열국시대), is the time before the rise of the Three Kingdoms of Korea, which included Goguryeo, Shilla, and Baekje, and occurred after the fall of Gojoseon. This time period consisted of numerous states that sprang up from the former territories of Gojoseon. Among these states, the largest and most influential were Dongbuyeo and Bukbuyeo.
See main article: Buyeo Kingdom.
After the fall of Gojoseon, Buyeo arose in today's North Korea and southern Manchuria, from about the 2nd century BC to 494. Its remnants were absorbed by Goguryeo in 494, and both Goguryeo and Baekje, two of the Three Kingdoms of Korea, considered themselves its successor.
Although records are sparse and contradictory, it is thought that in 86 BCE, Dongbuyeo (East Buyeo) branched out, after which the original Buyeo is sometimes referred to as Bukbuyeo (North Buyeo). Jolbon Buyeo was the predecessor to Goguryeo, and in 538, Baekje renamed itself Nambuyeo (South Buyeo).
Okjeo was a tribal state that was located in the northern Korean Peninsula, and was established after the fall of Gojoseon. Okjeo had been a part of Gojoseon before its fall. It never became a fully-developed kingdom due to the intervention of its neighboring kingdoms. Okjeo became a tributary of Goguryeo, and was eventually annexed into Goguryeo by Gwanggaeto Taewang in the 5th century.
Dongye was another small kingdom that was situated in the northern Korean Peninsula. Dongye bordered Okjeo, and the two kingdoms faced the same fate of becoming tributaries of the growing empire of Goguryeo. Dongye was also a former part of Gojoseon before its fall.
See main article: Samhan.
Samhan (三韓) refers to the three confederacies of Mahan, Jinhan, and Byeonhan. The Samhan were located in the southern region of the Korean Peninsula. These three confederacies eventually become the foundations, at which Baekje, Silla, and Gaya were established. Mahan was the largest and consisted of 54 states. Byeonhan and Jinhan both consisted of 12 states, bringing a total of 78 states within the Samhan. The term "Samhan" is later used to describe the Three Kingdoms of Korea.
Today, the hanja name for Korea comes from the hanja of Samhan (韓).
See main article: Three Kingdoms of Korea.
See main article: Goguryeo. Goguryeo was founded in 37 BC by Jumong (posthumous name Dongmyeongseong). Later, King Taejo centralized the government. Goguryeo was also the first Korean kingdom to adopt Buddhism as the state religion in 372, under King Sosurim reign.
Goguryeo reached its zenith in the fifth century, when reign of the King Gwanggaeto and his son, King Jangsu expanded into almost all of Manchuria and part of inner Mongolia, and took the Seoul region from Baekje. Gwanggaeto and Jangsu subdued Baekje and Silla during their times.
Goguryeo later fought and defeated massive Chinese invasions in the Goguryeo-Sui War of 598 - 614, contributing to Sui's fall, and continued to repel the Tang dynasty under several important generals including Yeon Gaesomun and Yang Manchun.
However, numerous wars with China exhausted Goguryeo and it fell into a weak state. After internal power struggles, it was conquered by an allied Silla-Tang forces in 668.
See main article: Baekje. Baekje's foundation by King Onjo in 18 BCE http://books.google.com/books?vid=ISBN1588113795&id=UuAIyYdrHJQC&pg=PA249&lpg=PA249&dq=paekche+18+bce&sig=qWEAprigj3Y81rj8le73UvjvQbo, as stated in the Samguk Sagi followed those of its neighbors and rivals, Goguryeo and Silla.
The Sanguo Zhi mentions Baekje as a member of the Mahan confederacy in the Han River basin (near present-day Seoul). It expanded into the southwest (Chungcheong and Jeolla provinces) of the peninsula and became a significant political and military power. In the process, Baekje came into fierce confrontation with Goguryeo and the Chinese commanderies in the vicinity of its territorial ambitions.
At its peak in the 4th century, it had absorbed all of the Mahan states and subjugated most of the western Korean peninsula (including the modern provinces of Gyeonggi, Chungcheong, and Jeolla, as well as part of Hwanghae and Gangwon) to a centralized government. Baekje acquired Chinese culture and technology through contacts with the Southern Dynasties during the expansion of its territory.
Baekje played a fundamental role in transmitting cultural developments, such as Chinese characters, Buddhism, iron-making, advanced pottery, and ceremonial burial into ancient Japan. Other aspects of culture were also transmitted when the Baekje court retreated to Japan after Baekje was conquered. Baekje was defeated by a coalition of Silla and Tang Dynasty forces in 660.
See main article: Silla. According to legend, the kingdom Silla began with the unification of six chiefdoms of the Jinhan confederacy by Bak Hyeokgeose in 57 BCE, in the southeastern area of Korea. Its territory included the present-day port city of Busan, and Silla later emerged as a sea power responsible for destroying Japanese pirates, especially during the Unified Silla period.
Silla artifacts, including unique gold metalwork, show influence from the northern nomadic steppes, with less Chinese influence than are shown by Goguryeo and Baekje. Silla expanded rapidly by occupying the Han River basin and uniting the city states. By the 2nd century, Silla existed as a large state, occupying and influencing nearby city states. Silla began to gain power when it annexed in 562 the Gaya confederacy, between Baekje and Silla. Silla often faced pressure from Baekje and Japan, and at various times allied and warred with Baekje and Goguryeo.
In 660, King Muyeol of Silla ordered his armies to attack Baekje. General Kim Yu-shin, aided by Tang forces, conquered Baekje. In 661, Silla and Tang moved on Goguryeo but were repelled. King Munmu, son of Muyeol and nephew of General Kim launched another campaign in 667 and Goguryeo fell in the following year.
See main article: Gaya confederacy. Gaya was a confederacy of chiefdoms in the Nakdong River valley of southern Korea, growing out of the Byeonhan confederacy of the Samhan period. In 562, Gaya ultimately was absorbed into Silla.
See main article: North South States Period. The term North-South States refers to Unified Silla and Balhae, during the time when Silla controlled the Korean peninsula while Balhae expanded into Manchuria. During this time, culture and technology significantly advanced, especially in Unified Shinla.
See main article: Unified Silla.
After the unification wars, the Tang Dynasty established territories in the former Goguryeo, and began to administer and establish communities in Baekje. Silla attacked the Chinese in Baekje and northern Korea in 671.
China then invaded Silla in 674 but led by General Kim Yu-shin, Silla defeated the Chinese army in the north. Silla drove the Tang forces out of the peninsula by 676 to achieve unification of most of the Three Kingdoms.
Unified Silla was a time when Korean arts flourished dramatically and Buddhism became a large part of Silla culture. Buddhist monasteries such as the Bulguksa are examples of advanced Korean architecture and Buddhist influence. State-sponsored art and architecture from this period include Hwangnyongsa Temple, Bunhwangsa Temple, and Seokguram Grotto, a World Heritage Site. Unified Silla was also a time of peace, as the Song Dynasty of China was nonaggressive. The Song was also an important trading partner with Silla.
Silla began to experience political troubles in 780. This severely weakened Silla and soon thereafter, descendants of the former Baekje established Later Baekje. In the north, rebels revived Goguryeo, beginning the Later Three Kingdoms period.
See main article: Balhae.
Balhae was founded after the only thirty years when Goguryeo's fallen. It was founded in the northern part of former lands of Goguryeo by Dae Joyeong, a former Goguryeo general. Balhae controlled the northernmost areas of the Korean Peninsula, much of Manchuria (though it didn't occupy Liaodong peninsula for much of history), and expanded into present-day Russian Maritime Province. Balhae styled itself as Goguryeo's successor state. It also adapted from the Tang Empire, for example in the layout of its capitals. I
In a time of relative peace and stability in the region, Balhae culture flourished, especially during the long reign of the third Emperor Mun (r. 737-793). Like Silla culture, the culture of Balhae was strongly influenced by Buddhism. However, Balhae was severely weakened by the tenth century, and the Khitan Liao Dynasty conquered Balhae in 926.
No historical records from Balhae have survived, and the Liao left no histories of Balhae. Goryeo (see below) absorbed some Balhae territory and received Balhae refugees, including the crown prince and the royal family, but compiled no known histories of Balhae either. The Samguk Sagi ("History of the Three Kingdoms"), for instance, includes passages on Balhae, but does not include a dynastic history of Balhae. The eighteenth century Joseon dynasty historian Yu Deukgong advocated the proper study of Balhae as part of Korean history, and coined the term "North and South States Period" to refer to this era.
See main article: Later Three Kingdoms.
The Later Three Kingdoms (892 - 936) consisted of Silla, Hubaekje ("Later Baekje"), and Taebong (also known as Hugoguryeo, "Later Goguryeo"). The latter two, established as Unified Silla declined in power, were viewed as heirs to the earlier Three Kingdoms of Korea.
Taebong (Later Goguryeo) was originally led by Gung Ye, a Buddhist monk who founded Later Goguryeo. The unpopular Gung Ye was deposed by Wang Geon (877-943) in 918, when Gung Ye killed his wife and son. Wang Geon was popular with his people, and he decided to unite the entire peninsula under one government. He attacked Later Baekje in 934 and received the surrender of Silla in the following year. In 936, Goryeo conquered Later Baekje.
See main article: Goryeo.
Goryeo was founded in 918 and by 936, replaced Silla as the ruling dynasty of Korea. ("Goryeo" is a short form of "Goguryeo" and the source of the English name "Korea.") The dynasty lasted until 1392. During this period laws were codified, and a civil service system was introduced. Buddhism flourished, and spread throughout the peninsula. The development of celadon industry flourished in 12th and 13th century. The publication of Tripitaka Koreana, and world's first metal printing technology in 13th century, attests to Goryeo's cultural achievements.
In 1231 the Mongols began its campaigns against Korea and after 25 years of struggle, the royal family relented by signing a treaty with the Mongols. For the following 80 years Goryeo survived, but became a vassal of the Mongol-ruled Yuan Dynasty in China. In the 1350s, the Yuan Dynasty declined rapidly due to internal struggles. King Gongmin was free at last to reform a Goryeo government. Gongmin had various problems that needed to be dealt with, which included the removal of pro-Mongol aristocrats and military officials, the question of land holding, and quelling the growing animosity between the Buddhists and Confucian scholars.
Another problem was that "Japanese" pirates were now organizing deep raids into the country. General Lee Seonggye distinguished himself by repelling the pirates in a series of successful engagements. The Goryeo dynasty would last until 1392, when Yi Seonggye, who had heavy support among aristocracy, would easily take power in a coup.
See main article: Joseon Dynasty.
In 1392 a Korean general, Yi Seonggye, was sent to China to campaign against the Ming Dynasty, but instead he returned to overthrow the Goryeo king and establish a new dynasty. He named it the Joseon Dynasty in honor of the previous Joseon before (Gojoseon is the first Joseon. "Go" was added to distinguish between the two). King Taejo moved the capital to Hanseong (formerly Hanyang; modern-day Seoul) and built the Gyeongbokgung palace. In 1394 he adopted Confucianism as the country's official religion, resulting in much loss of power and wealth by the Buddhists. Joseon experienced advances in science and culture; most notably, the hangul alphabet was invented by King Sejong in 1443. The Joseon Dynasty is believed to have been the longest-lived actively ruling dynasty in East Asia during the last millennium.
Joseon maintained a stable economy during peaceful times. After the Joseon court was established and completed, the economy began to prosper as well. Early during the Joseon Dynasty, the economy was stable, especially during King Sejong's rule. However, the economy suffered after the Japanese invasions 1592-1598 and internal court corruption, bribery, and heavy tax, strained the Korean economy.
During Joseon, an endogamic hereditary caste system existed that greatly affected Korea's social development. With the king and the royal family sitting atop the hereditary system, there also existed a parasitic class of land owners and agrarian bureaucrats known as Yangban who lived off the efforts of tenant farmers and slaves, through heavy taxation and extortion. A merchant class, per se, did not exist in Joseon Korea as had existed in China, as commerce and trade was essentially forbidden by the Joseon kings, and if conducted at all, had to be conducted covertly as illegal black market or barter and trade. Slaves constituted the largest class in Joseon Korea, essentially consisting of not only tenant farmers and black-marketeers, but also entertainers, craftsmen, prostitutes, laborers, shamans, vagabonds, outcasts, soldiers and criminals.
Joseon dealt with a pair of Japanese invasions from 1592 to 1598 (Imjin War). This conflict brought prominence to Admiral Yi Sun-sin, and the use of turtle ships and hwachas by the Korean military. Subsequently, there were invasions from Manchuria in 1627 (see the First Manchu invasion of Korea) and again in 1636 (see the Second Manchu invasion of Korea), after which the Joseon dynasty recognized the suzerainty of the Qing Empire. There was trade with the Japanese at Busan, and emissaries were sent to Edo in Japan. Europeans were not permitted to trade at Korean ports until the 1880s.
During the 19th century, Korea tried to control foreign influence by closing the borders to all nations but China. In 1853 the USS South America, an American gunboat, visited Busan for 10 days and had amiable contact with local Korean officials. Several Americans who were shipwrecked on Korea in 1855 and 1865 were also treated well and sent to China for repatriation. The Joseon court which ruled Korea, was well aware of the foreign invasions and treaties involving Qing China, as well as the Opium Wars, and followed a cautious policy of slow exchange with the West.
See main article: French Campaign against Korea, 1866. In 1866, reacting to greater numbers of Korean converts, the Korean court clamped down on the illicit French missionaries, massacring French Catholic missionaries and Koreans converts alike. That same year France invaded and occupied portions of Ganghwa Island in the fall of 1866. The Korean army lost heavily, and the French abandoned the island. This event is also called 'Byeonginyangyo'(병인양요)
See main article: United States Korean expedition. The General Sherman, a British owned armed merchant marine sidewheel schooner, attempted to open Korea to trade in 1866. After an initial miscommunication, the ship sailed upriver and became stranded near Pyongyang. After being ordered to leave by Korean officials, the American crewmen killed four Korean inhabitants, kidnapped a military officer and engaged in sporadic fighting that continued for four days. After two efforts to destroy the ship failed, the USS General Sherman was finally set afire by Korean fireships laden with primitive explosives.
In response, the United States confronted Korea militarily in 1871, killing 350 Koreans and retreating in what the Koreans call the Sinmiyangyo. Five years later, the reclusive Korea signed a trade treaty with Japan, and in 1882 signed a treaty with the United States, ending several centuries of isolationism.
By 1876, a rapidly modernizing Japan forced Korea to open its ports and successfully challenged the Qing Empire in the Sino-Japanese War (1894-1895). In 1895, the Japanese murdered Empress Myeongseong, who had sought Russian help, and the Russians were forced to retreat from Korea.
See main article: Korean Empire. In 1897, Joseon was renamed the Korean Empire, and King Gojong became Emperor Gojong. A period of Russian influence followed, until Japan defeated Russia in the Russo-Japanese War (1904-1905). Korea effectively became a protectorate of Japan on 25 July 1905, the 1905 Protectorate Treaty having been promulgated without Emperor Gojong's required seal.
See main article: Korea under Japanese rule.
In 1910 Japan effectively annexed Korea by the Japan-Korea Annexation Treaty. While the legality of the treaty is still asserted by Japan, it is generally not accepted in Korea because it was not signed by the Emperor of Korea as required and violated international convention on external pressures regarding treaties. Korea was controlled by Japan under a so-called Governor-General of Korea until Japan's unconditional surrender to the Allied Forces, on 15 August 1945, with de jure sovereignty deemed to have passed from Joseon Dynasty to the Provisional Government of the Republic of Korea.
European-styled transport and communication networks were established across the nation. This facilitated Japanese exploitation, but modernization had little if any effect on the Korean people, but was mainly being used to serve Japanese trade needs, and their tight centralized controls. The Japanese removed the Joseon hierarchy, destroyed the Korean Palace, and revamped Korea's taxation system to evict tenant farmers, export Korean rice crops to Japan which provoked Korean famines; and brought in a punitive series of measures which included murdering those who refused to pay taxes in the provinces; forced slavery in roadworks, mines, and first sweat shop factories in Korea. Then Japan further promoted slavery of Koreans in Japan and its occupied territories by transporting forced slaves to these areas.
After the Korean Emperor Gojong died in January 1919, with a rumor of poisoning, liberation rallies against Japanese invaders took place nationwide on 1 March 1919 (the March 1st (Samil) Movement). This movement was suppressed by force and about 7,000 were killed by Japanese soldiers and police. An estimated 2 million people took part in peaceful, pro-liberation rallies. (The Japanese record claims less than half million.) Many Korean Christians, including an entire village of Jeamri, were crucified or burnt alive in churches as they fought for Korean liberation. This movement was partly inspired by United States president Woodrow Wilson's speech of 1919, declaring support for right of self determination and an end to colonial rule for Europeans. No comment was made by Wilson on Korean liberation, perhaps as a pro-Japan faction in the USA sought trade inroads into China through the Korean peninsula.
The Provisional Government of the Republic of Korea was established in Shanghai, China, in an aftermath of March 1st Movement, which coordinated the Liberation effort and resistance against Japanese control. Some of the achievements of the Provisional Government include the Battle of Chingshanli of 1920 and the ambush of Japanese Military Leadership in China in 1932. The Provisional Government is considered to be the de jure government of the Korean people between the period 1919 to 1948, and its legitimacy is enshrined in the preamble to the constitution of the South Korea.
Continued anti-Japanese uprisings, such as the nationwide uprising of students in November 1929, led to the strengthening of military rule in 1931. After the outbreaks of the Sino-Japanese War in 1937 and World War II Japan attempted to exterminate Korea as a nation. Worship at Japanese Shinto shrines was made compulsory. The school curriculum was radically modified to eliminate teaching in the Korean language and history within Korea. The continuance of Korean culture itself began to be illegal. Korean culture and economy suffered heavy losses. The Korean language was banned and Koreans were forced to adopt Japanese names. Numerous Korean cultural artifacts were destroyed or taken to Japan. To this day, valuable Korean artifacts can often be found in Japanese museums or among private collectors. Newspapers were prohibited from publishing in Korean language and the study of Korean history was banned at university with Korean textbooks burnt, destroyed, or made illegal which Editing Agency of Korean History oversaw. According to an investigation by the South Korean government, 75,311 cultural assets were taken from Korea. Japan has 34,369, The United States has 17,803.
Some Koreans left the Korean peninsula to Manchuria and Primorsky Krai. Koreans in Manchuria formed resistance groups known as Dongnipgun (Liberation Army) which would travel in and out of the Korean-Chinese boundary, fighting guerrilla warfare with the Japanese forces. These guerilla armies would come together in 1940s as Korean Liberation Army and the Liberation Army took part in allied action in China and parts of South East Asia. Tens of thousands of Koreans also joined the Peoples Liberation Army and the National Revolutionary Army.
During World War II, Koreans were forced to support the Japanese war effort. Tens of thousands of men were conscripted into Japan's military. Around 200,000 girls and women, mostly from Korea and China, were conscripted as sex slaves, euphemistically called "comfort women".
See main article: Division of Korea.
The unconditional surrender of Japan, the earlier collapse of Nazi Germany, combined with fundamental shifts in global politics and ideology, led to the division of Korea into two occupation zones effectively starting on September 8, 1945, with the United States administering the southern half of the peninsula and the Soviet Union taking over the area north of the 38th parallel. The Provisional Government was ignored, mainly due to American misconception that it was too communist-aligned. This division was meant to be temporary and was first intended to return a unified Korea back to its people until the United States, United Kingdom, Soviet Union, and Republic of China could arrange a trusteeship administration.
At the Cairo Conference on November 22, 1943, it was agreed that Korea would be free "in due course Korea shall become free and independent”; at a later meeting in Yalta in February 1945, it was agreed to establish a four-power trusteeship over Korea. On August 9, 1945, Soviet tanks entered northern Korea from Siberia, meeting little to no resistance. Japan surrendered to the Allied Forces on August 15, 1945.
In December 1945, a conference convened in Moscow to discuss the future of Korea. A 5-year trusteeship was discussed, and a joint Soviet-American commission was established. The commission met intermittently in Seoul but deadlocked over the issue of establishing a national government. In September 1947, with no solution in sight, the United States submitted the Korean question to the UN General Assembly.
Initial hopes for a unified, independent Korea quickly evaporated as the politics of the Cold War and opposition to the trusteeship plan from Korean anti-communists resulted in the 1948 establishment of two separate nations with diametrically opposed political, economic, and social systems. On June 25 1950, by its resolution 82 the Security Council of the United Nations recognised the Republic of Korea as the sole legal government of Korea. In June 1950 the Korean War broke out when North Korea breached the 38th parallel line to invade the South, ending any hope of a peaceful reunification for the time being. Because of the American rule over South Korea, post-independence South Korea became a democracy, like the United States of America. Similarly, due to the Soviet occupation of North Korea, post-independence North Korea established a communist government, parallel to the Union of Soviet Socialist Republics.