Question: Why was the country where the last name Shin comes from divided at the 38th parallel at the end of WWII?

full_context: Document 1: Korean War: Korea was ruled by Japan from 1910 until the closing days of World War II. In August 1945, the Soviet Union declared war on Japan and—by agreement with the United States—occupied Korea north of the 38th parallel. U.S. forces subsequently occupied the south and Japan surrendered. By 1948, two separate governments had been set up. Both governments claimed to be the legitimate government of Korea, and neither side accepted the border as permanent. The conflict escalated into open warfare when North Korean forces—supported by the Soviet Union and China—invaded South Korea on 25 June 1950. On that day, the United Nations Security Council recognized this North Korean act as invasion and called for an immediate ceasefire. On 27 June, the Security Council adopted S/RES/83: Complaint of aggression upon the Republic of Korea and decided the formation and dispatch of the UN Forces in Korea. Twenty-one countries of the United Nations eventually contributed to the defense of South Korea, with the United States providing 88% of the UN's military personnel.
Document 2: Han (Chinese surname): Han (simplified Chinese: 韩; traditional Chinese: 韓; pinyin: Hán; Korean: 한) is a common Chinese surname. The spelling ``Han ''is based on China's pinyin system and so used throughout Mainland China. Spelling can vary from 'Hon' in Cantonese - speaking areas to 'Hang' in Hainan.
Document 3: Chinese name: Modern Chinese names consist of a surname known as xing (姓, xìng), which comes first and is usually but not always monosyllabic, followed by a personal name called ming (名, míng), which is nearly always mono - or disyllabic. Prior to the 20th century, educated Chinese also utilized a ``courtesy name ''or`` style name'' called zi (字, zì) by which they were known among those outside their family and closest friends.
Document 4: Yuan dynasty: Shi Tianze was a Han Chinese who lived in the Jin dynasty. Interethnic marriage between Han and Jurchen became common at this time. His father was Shi Bingzhi (史秉直, Shih Ping-chih). Shi Bingzhi was married to a Jurchen woman (surname Na-ho) and a Han Chinese woman (surname Chang); it is unknown which of them was Shi Tianze's mother. Shi Tianze was married to two Jurchen women, a Han Chinese woman, and a Korean woman, and his son Shi Gang was born to one of his Jurchen wives. The surnames of his Jurchen wives were Mo-nien and Na-ho; the surname of his Korean wife was Li; and the surname of his Han Chinese wife was Shi. Shi Tianze defected to Mongol forces upon their invasion of the Jin dynasty. His son Shi Gang married a Kerait woman; the Kerait were Mongolified Turkic people and were considered part of the "Mongol nation". Shi Tianze (Shih T'ien-tse), Zhang Rou (Chang Jou, 張柔), and Yan Shi (Yen Shih, 嚴實) and other high ranking Chinese who served in the Jin dynasty and defected to the Mongols helped build the structure for the administration of the new state. Chagaan (Tsagaan) and Zhang Rou jointly launched an attack on the Song dynasty ordered by Töregene Khatun.
Document 5: Korean War: Korea was ruled by Imperial Japan from 1910 until the closing days of World War II. In August 1945, the Soviet Union declared war on Imperial Japan, as a result of an agreement with the United States, and liberated Korea north of the 38th parallel. U.S. forces subsequently moved into the south. By 1948, as a product of the Cold War between the Soviet Union and the United States, Korea was split into two regions, with separate governments. Both claimed to be the legitimate government of all of Korea, and neither accepted the border as permanent. The conflict escalated into open warfare when North Korean forces -- supported by the Soviet Union and China -- moved into the south on 25 June 1950. On 27 June, the United Nations Security Council authorized the formation and dispatch of UN forces to Korea to repel what was recognized as a North Korean invasion. Twenty - one countries of the United Nations eventually contributed to the UN force, with the United States providing 88% of the UN's military personnel.
Document 6: Shin (Korean surname): Shin is a Korean family name. It is cognate to the Chinese family names Shēn and Xin. According to the 2000 census in South Korea, there were 911,556 people carrying the Shin surname.
Document 7: Korean War: On the night of 10 August in Washington, American Colonels Dean Rusk and Charles H. Bonesteel III were tasked with dividing the Korean Peninsula into Soviet and U.S. occupation zones and proposed the 38th parallel. This was incorporated into America's General Order No. 1 which responded to the Japanese surrender on 15 August. Explaining the choice of the 38th parallel, Rusk observed, "even though it was further north than could be realistically reached by U.S. forces, in the event of Soviet disagreement...we felt it important to include the capital of Korea in the area of responsibility of American troops". He noted that he was "faced with the scarcity of US forces immediately available, and time and space factors, which would make it difficult to reach very far north, before Soviet troops could enter the area". As Rusk's comments indicate, the Americans doubted whether the Soviet government would agree to this. Stalin, however, maintained his wartime policy of co-operation, and on 16 August the Red Army halted at the 38th parallel for three weeks to await the arrival of U.S. forces in the south.
Document 8: Division of Korea: The division of Korea between North and South Korea occurred after World War II, ending the Empire of Japan's 35 - year rule over Korea in 1945. The United States and the Soviet Union each occupied a portion of the peninsula, with the boundary between their zones of control along the 38th parallel.
Document 9: Division of Korea: At the Tehran Conference and the Yalta Conference, the Soviet Union promised to join its allies in the Pacific War in two to three months after victory in Europe. On August 8, 1945, three months to the day after the end of hostilities in Europe, and two days after the atomic bomb was dropped on Hiroshima, the Soviet Union declared war on Japan. Soviet troops advanced rapidly, and the US government became anxious that they would occupy the whole of Korea. On August 10, 1945 two young officers -- Dean Rusk and Charles Bonesteel -- were assigned to define an American occupation zone. Working on extremely short notice and completely unprepared, they used a National Geographic map to decide on the 38th parallel. They chose it because it divided the country approximately in half but would place the capital Seoul under American control. No experts on Korea were consulted. The two men were unaware that forty years before, Japan and pre-revolutionary Russia had discussed sharing Korea along the same parallel. Rusk later said that had he known, he ``almost surely ''would have chosen a different line. The division placed sixteen million Koreans in the American zone and nine million in the Soviet zone. To the surprise of the Americans, the Soviet Union immediately accepted the division. The agreement was incorporated into General Order No. 1 (approved on 17 August 1945) for the surrender of Japan.
Document 10: Chae Myung-shin: Chae commanded "Skeleton Corps", guerrilla corps during the Korean War, and became the authority on guerrilla tactics of the South Korean Army.
Document 11: Chiron (missile): The KP-SAM Shin-Gung or Shin-Kung (Korean: hangul: 신궁, hanja: 新弓) is a South Korean shoulder-launched surface-to-air missile manufactured by LIG Nex1. It is marketed internationally as the Chiron.
Document 12: Chinese characters: When learning how to write hanja, students are taught to memorize the native Korean pronunciation for the hanja's meaning and the Sino-Korean pronunciations (the pronunciation based on the Chinese pronunciation of the characters) for each hanja respectively so that students know what the syllable and meaning is for a particular hanja. For example, the name for the hanja 水 is 물 수 (mul-su) in which 물 (mul) is the native Korean pronunciation for "water", while 수 (su) is the Sino-Korean pronunciation of the character. The naming of hanja is similar to if "water" were named "water-aqua", "horse-equus", or "gold-aurum" based on a hybridization of both the English and the Latin names. Other examples include 사람 인 (saram-in) for 人 "person/people", 큰 대 (keun-dae) for 大 "big/large//great", 작을 소 (jakeul-so) for 小 "small/little", 아래 하 (arae-ha) for 下 "underneath/below/low", 아비 부 (abi-bu) for 父 "father", and 나라이름 한 (naraimreum-han) for 韓 "Han/Korea".
Document 13: Division of Korea: A Soviet - US Joint Commission met in 1946 and 1947 to work towards a unified administration, but failed to make progress due to increasing Cold War antagonism and to Korean opposition to the trusteeship. Meanwhile, the division between the two zones deepened. The difference in policy between the occupying powers led to a polarization of politics, and a transfer of population between North and South. In May 1946 it was made illegal to cross the 38th parallel without a permit.
Document 14: History of Korea: After the end of WWII in 1945, the Allies divided the country into a northern area, protected by the Soviets, and a southern area protected primarily by the United States. In 1948, when the powers failed to agree on the formation of a single government, this partition became the modern states of North and South Korea. The peninsula was divided at the 38th Parallel: the ``Republic of Korea ''was created in the south, with the backing of the US and Western Europe, and the`` Democratic People's Republic of Korea'' in the north, with the backing of the Soviets and the communist People's Republic of China. The new premier of North Korea, Kim il - Sung launched the Korean War in 1950 in an attempt to reunify the country under Communist rule. After immense material and human destruction, the conflict ended with a cease - fire in 1953. The two nations officially remain at war because a peace treaty was never signed. Both states were accepted into the United Nations in 1991.
Document 15: World population milestones: Country / nationality Population Born (date) Name and surname Notes Foot - notes Munich 1m 15 December 1957 Thomas Seehaus Awarded by Mayor Thomas Wimmer with a 1,000 mark savings account. United States 200m 20 November 1967 Robert Ken Woo Jr Named by Life magazine, not the government. None named for 300m. Australia 15m 29 January 1982 Sally Hodgson Awarded by Minister for Immigration and Ethnic Affairs Ian Macphee Indonesia 200m 4 February 1997 Wahyu Nusantara Aji Complains that government promises of support were not kept India 1b 11 May 2000 Aastha Arora speculation re Independence Day 1999 till Registrar demurred. Complains that government promises of support were not kept. Kyrgyzstan 5m 27 August 2002 Tynchtykbek Kuramayev Australia 21m 29 June 2007 Mia Ruby Templeton Awarded by Treasurer Peter Costello Taiwan 23m 17 July 2008 Wu Cheng - en certificate from Premier of the Republic of China Liu Chao - shiuan Auckland Region, New Zealand 1.5 m 1 February 2012 Ramonah Patience Toomalatai Welcomed by Len Brown the Mayor of Auckland Kazakhstan 17m 17 May 2013 Altynbek Eskaraev Алтынбек Ескараев Vietnam 90m 1 November 2013 Nguyễn Thị Thùy Dung randomly chosen by the General Office of Population and Family Planning from among two dozen babies born that day Philippines 100m 27 July 2014 Chonalyn Sentino Wake County, North Carolina 1m 22 August 2014 Anderson Grace Hughes Offered full scholarship by Wake Technical Community College Mongolia 3m 24 January 2015 Mongoljin Khatanbold Silicon Valley 3m 5 May 2015 Max Danner Utah 3m 24 October 2015 Sadie Christensen By governor Gary Herbert Kyrgyzstan 6m 27 November 2015 Aylin Kojosheva
ground_truth: it divided the country approximately in half
sub_queries: where does the last name shinn come from Answer: Korea
why was Korea divided at the 38th parallel at the end of wwii Answer: it divided the country approximately in half