Korea (Korean: 한국 or 조선) is a civilization and formerly unified nation currently divided into two states. Located on the Korean Peninsula, it borders China to the northwest, Russia to the northeast, and is separated from Japan to the east by the Korea Strait. Korea was united until 1948; at that time it was split into South Korea and North Korea. South Korea, officially the Republic of Korea, is a capitalist, democratic and developed country, with memberships in the United Nations, WTO, OECD and G-20 major economies. North Korea, officially the Democratic People's Republic of Korea, is a single-party communist country founded by Kim Il-sung and currently led by his son Kim-Jong-il. Archaeological and linguistic evidence suggest the origins of the Korean people were in Altaic language-speaking migrants from south-central Siberia,[1] who populated ancient Korea in successive waves from the Neolithic age to the Bronze Age.[2] The adoption of the Chinese writing system ("Hanja" in Korean) in the 2nd century BCE, and Buddhism in the 4th century CE, had profound effects on the Three Kingdoms of Korea. Korea later passed on a modified version of these cultural advances to Japan.[3][4][5][6] Since the Goryeo Dynasty, Korea was ruled by a single government and maintained political and cultural independence until the 20th century, despite the Mongol invasions of the Goryeo Dynasty in the 13th century and Japanese invasions of the Joseon Dynasty in the 16th century. In 1377, Korea produced the Jikji, the world's oldest existing document printed with movable metal type.[7] In the 15th century, the turtle ships were deployed, and King Sejong the Great promulgated the Korean alphabet Hangul. During the latter part of the Joseon Dynasty, Korea's isolationist policy earned it the Western nickname the "Hermit Kingdom". By the late 19th century, the country became the object of the colonial designs of Japan and Europe. In 1910, Korea was forcibly annexed by Japan and remained occupied until the end of World War II in August 1945. In 1945, the Soviet Union and the United States agreed on the surrender and disarming of Japanese troops in Korea; the Soviet Union accepting the surrender of Japanese weaponry north of the 38th parallel and the United States taking the surrender south of it. This minor decision by allied armies soon became the basis for the division of Korea by the two superpowers, exacerbated by their inability to agree on the terms of Korean independence. The two Cold War rivals then established governments sympathetic to their own ideologies, leading to Korea's current division into two political entities: North Korea and South Korea. "Korea" derives from the Goryeo period of Korean history, which in turn referred to the ancient kingdom of Goguryeo. Merchants of the Middle East called it Cauli (from the Chinese pronunciation), which then came to be spelled Corea and Korea. Korea is now commonly used in English contexts by both North and South Korea. A K is often used in Germanic languages, while a C is preferred in Romance languages. In the Korean language, Korea as a whole is referred to as Han-guk in South Korea, and Chosŏn in North Korea. The latter name, also Romanised Joseon, is from the Joseon Dynasty and the earlier Gojoseon. "The Land of the Morning Calm" is an English language nickname loosely derived from the hanja characters for Joseon. Korean Academy of Social Sciences discovered ancient human fossils originating from about 100,000 BCE in the lava at a stone city site in Korea. Fluorescent and high-magnetic analyses indicate the volcanic fossils may be from as early as 300,000 BCE.[8] The best preserved Korean pottery goes back to the paleolithic times around 10,000 BCE, and the Neolithic period begins around 6000 BCE. Gojoseon's founding legend describes Dangun, a descendent of heaven, as establishing the kingdom in 2333 BCE.[9] Archaeological and contemporary written records indicate it developed from a federation of walled cities into a centralised kingdom sometime between the 7th and 4th centuries BCE. The original capital may have been at the Manchuria-Korea border, but was later moved to what is today Pyongyang, North Korea. In 108 BCE, the Chinese Han Dynasty defeated Wiman Joseon and installed four commanderies in the area of Liaoning and the northern Korean peninsula. By 75 BCE, three of those commanderies had fallen, but the Lelang Commandery remained as a center of cultural and economic exchange with successive Chinese dynasties until 313, when it fell to Goguryeo. The hi Proto-Three Kingdoms period, sometimes called the Several States Period, is the earlier part of what is commonly called the Three Kingdoms Period, following the fall of Gojoseon but before Goguryeo, Baekje, and Silla fully developed into kingdoms. This time period saw numerous states spring up from the former territories of Gojoseon. Buyeo arose in today's North Korea and southern Manchuria, from about the 2nd century BCE 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. Okjeo and Dongye of northern Korea were eventually absorbed into the growing Goguryeo. Located in the southern part of the Korean Peninsula, Samhan refers to the three confederacies of Mahan, Jinhan, and Byeonhan. Mahan was the largest and consisted of 54 states. Byeonhan and Jinhan both consisted of twelve states, bringing a total of 78 states within the Samhan. These three confederacies eventually developed into Baekje, Silla, and Gaya. The Three Kingdoms of Korea (Goguryeo, Silla, and Baekje) dominated the peninsula and parts of Manchuria during the early Common Era. They competed with each other both economically and militarily. Goguryeo united Buyeo, Okjeo, Dongye and other states in the former Gojoseon territory.[10] Goguryeo was the most dominant power; it reached its zenith in the fifth century, when reign of the Gwanggaeto the Great and his son, Jangsu expanded territory 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. After the 7th Century, Goguryeo was constantly at war with the Sui and Tang dynasties of China. Founded around modern day Seoul, the southwestern kingdom Baekje expanded far beyond Pyongyang during the peak of its powers 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 centralised government. Baekje acquired Chinese culture and technology through contacts with the Southern Dynasties during the expansion of its territory. Historic evidence suggests that Japanese culture, art, and language was strongly influenced by the kingdom of Baekje and Korea itself. Archeological findings have further confirmed many of these hypotheses but extensive investigation is often restricted by the Japanese government and is usually conducted by government-appointed groups. Although later records claim that Silla, in the southeast, was the oldest of the three kingdoms, it is now believed to have been the last kingdom to develop. By the 2nd century, Silla existed as a large state, occupying and influencing nearby city states. Silla began to gain power when it annexed the Gaya confederacy in 562 CE. The Gaya confederacy was located between Baekje and Silla. The three kingdoms of Korea often warred with each other and Silla often faced pressure from Baekje and Goguryeo but at various times Silla also allied with Baekje and Goguryeo in order to gain dominance over the peninsula. In 660, King Muyeol of Silla ordered his armies to attack Baekje. General Kim Yu-shin(Gim Yu-sin), 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. In the 5th, 6th, and 7th centuries, Silla's power gradually extended across the Korean Peninsula. Silla first annexed the adjacent Gaya confederacy. By the 660s, Silla formed an alliance with the Tang Dynasty of China to conquer Baekje and later Goguryeo. After repelling Chinese forces, Silla partially unified the Peninsula, beginning a period often called Unified Silla. In the north, former Goguryeo General Dae Joyeong led a group of Goguryeo refugees to the Jilin area in Manchuria and founded Balhae (698 CE - 926 CE) as the successor to Goguryeo. At its height, Balhae's territory extended from northern Manchuria down to the northern provinces of modern-day Korea. Balhae was destroyed by the Khitans in 926. Unified Silla fell apart in the late 9th century, giving way to the tumultuous Later Three Kingdoms period (892-935). Goryeo unified the Later Three Kingdoms and absorbed Balhae refugees. The country Goryeo was founded in 918 and 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 onto 80,000 wooden blocks and the invention of the world's first movable-metal-type printing press in 13th century attest to Goryeo's cultural achievements. Their dynasty was threatened by Mongol invasion from the 1230s into the 1270s, but the dynastic line continued to survive until 1392 since they negotiated a treaty with the Mongols that kept its sovereign power. In 1350s, 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. In 1392, the general Yi Seong-gye established the Joseon Dynasty (1392-1910) with a largely bloodless coup. He named it the Joseon Dynasty in honor of the previous Joseon before (Gojoseon is the first Joseon. "Go", meaning "old", was added to distinguish between the two).