Question: When did the US go to war with the country of Salangeul chajaseo?

full_context: Document 1: A Maori Maid's Love: A Maori Maid's Love (Originally titled The Surveyor's Daughter) is a 1916 Australian silent film directed by Raymond Longford about an interracial romance between a white man and a Māori girl. It is considered a lost film as there are no known copies.
Document 2: Battle of Taejon: The Battle of Taejon (14–21 July 1950) was an early battle of the Korean War, between American and North Korean forces. Forces of the United States Army attempted to defend the headquarters of the 24th Infantry Division. The 24th Infantry Division was overwhelmed by numerically superior forces of the Korean People's Army (KPA) at the major city and transportation hub of Taejon. The 24th Infantry Division's regiments were already exhausted from the previous two weeks of delaying actions to stem the advance of the KPA.
Document 3: Korean War: Meanwhile, U.S. garrisons in Japan continually dispatched soldiers and matériel to reinforce defenders in the Pusan Perimeter. Tank battalions deployed to Korea directly from the U.S. mainland from the port of San Francisco to the port of Pusan, the largest Korean port. By late August, the Pusan Perimeter had some 500 medium tanks battle-ready. In early September 1950, ROK Army and UN Command forces outnumbered the KPA 180,000 to 100,000 soldiers. The UN forces, once prepared, counterattacked and broke out of the Pusan Perimeter.
Document 4: Land of Love: Land of Love (German: Land der Liebe) is a 1937 German romance film directed by Reinhold Schünzel and starring Albert Matterstock, Gusti Huber and Valerie von Martens. Although Schünzel was Jewish he had been allowed to continue directing films in Germany after the Nazi takeover. However, this film faced objections from the censors and from Joseph Goebbels. It was briefly shown and then disappeared from cinemas. It was Schünzel's final German film as director, and he went into exile shortly afterwards.
Document 5: Trial on the Road: "Trial on the Road" was censored and taken out of circulation in the Soviet Union for 15 years after its release due to its controversial depiction of Soviet soldiers. The film is based on a story by the director's father, Yuri German. The screenplay was written by Eduard Volodarsky.
Document 6: Korean War: After the Incheon landing, the 1st Cavalry Division began its northward advance from the Pusan Perimeter. "Task Force Lynch" (after Lieutenant Colonel James H. Lynch), 3rd Battalion, 7th Cavalry Regiment, and two 70th Tank Battalion units (Charlie Company and the Intelligence–Reconnaissance Platoon) effected the "Pusan Perimeter Breakout" through 106.4 miles (171.2 km) of enemy territory to join the 7th Infantry Division at Osan. The X Corps rapidly defeated the KPA defenders around Seoul, thus threatening to trap the main KPA force in Southern Korea.
Document 7: Seoul 1945: In July 2006, Rhee In-soo, adopted son of South Korea's first president Syngman Rhee, and Jang Byung-hye, daughter of former prime minister Jang Taek-sang, filed a lawsuit against the producers of "Seoul 1945", claiming that the drama distorts history and belittles the achievements of their late fathers.
Document 8: Korean War: On 25 November at the Korean western front, the PVA 13th Army Group attacked and overran the ROK II Corps at the Battle of the Ch'ongch'on River, and then decimated the US 2nd Infantry Division on the UN forces' right flank. The UN Command retreated; the U.S. Eighth Army's retreat (the longest in US Army history) was made possible because of the Turkish Brigade's successful, but very costly, rear-guard delaying action near Kunuri that slowed the PVA attack for two days (27–29 November). On 27 November at the Korean eastern front, a U.S. 7th Infantry Division Regimental Combat Team (3,000 soldiers) and the U.S. 1st Marine Division (12,000–15,000 marines) were unprepared for the PVA 9th Army Group's three-pronged encirclement tactics at the Battle of Chosin Reservoir, but they managed to escape under Air Force and X Corps support fire—albeit with some 15,000 collective casualties.
Document 9: United States in the Korean War: The first battle the Americans entered in the Korean War was the Battle of Osan, where about four hundred strong landed in Pusan airport on the first of July. The American troops were sent off to Taejon the next morning where Major General John H. Church the head of U.S. field headquarters was confident in the US troop's strengths to push back the North Koreans. On July fifth the troops were finally put to the test when North Korean tanks crept towards Osan. The four hundred infantryman of the U.S. also called Task Force Smith opened fire on the North Koreans at 8: 16 am. Only four of the North Korean tanks were destroyed and twenty - nine kept moving forward breaking the US line. At the end of the battle only two more North Korean Tanks and two regiments of North Korean infantry were destroyed. The US had lost the battle, revealing that the mere sight of US troops would not reverse the military balance in Korea. By early August, the North Korean troops had pushed back the US and South Korean troops all the way to Naktong River, which is located about thirty miles from Pusan. The two weeks of fighting following this resulted in the most casualties of US troops than any other equivalent period of this war. However, during this time the US pushed supplies and personnel to Korea and by the end of July South Koreans and US troops outnumbered the North Koreans, although the North had pushed back the US and South by an amazing amount the North had suffered over fifty thousand casualties. Also because North Koreas supply lines were so lengthy and with the US in control of the water and air replenishing there losses were slow.
Document 10: Salangeul chajaseo: Salangeul chajaseo (사랑을 찾아서) (In Search of Love, or Looking For Love) is a 1929 Korean film written, directed, produced, edited by and starring Na Woon-gyu (1902-1937). The film premiered at the Choseon Theater in April, 1929. More than one thousand extras from Na's hometown Hoeryong were employed in the filming of "Salangeul chajaseo", making the film into a symbolic epic national exodus as a protest against the Japanese occupation of Korea. Originally entitled "Crossing the Duman River" (두만강을 건너서), the film was banned and censored by the Japanese occupying authorities after its first showing. Popular demand caused it to be re-released, though in a heavily edited form, and renamed "In Search of Love". As with the vast majority of Korean films of this era, "Salangeul chajaseo" is a lost film.
Document 11: Korean War: The Battle of Osan, the first significant American engagement of the Korean War, involved the 540-soldier Task Force Smith, which was a small forward element of the 24th Infantry Division which had been flown in from Japan. On 5 July 1950, Task Force Smith attacked the North Koreans at Osan but without weapons capable of destroying the North Koreans' tanks. They were unsuccessful; the result was 180 dead, wounded, or taken prisoner. The KPA progressed southwards, pushing back the US force at Pyongtaek, Chonan, and Chochiwon, forcing the 24th Division's retreat to Taejeon, which the KPA captured in the Battle of Taejon; the 24th Division suffered 3,602 dead and wounded and 2,962 captured, including the Division's Commander, Major General William F. Dean.
Document 12: Nambugun: Nambugun: North Korean Partisan in South Korea is a 1990 South Korean war drama film directed by Chung Ji-young. It is based upon the experiences of Lee Tae, a war correspondent during the Korean War.
Document 13: United States in the Korean War: In response to North Korea's invasion into South Korea the United Nations convened to formulate a response. The U.N. demanded North Korea's immediate withdrawal and, when this was not met, United States Army General Douglas MacArthur was appointed supreme commander of U.N. forces. To halt the rapid progress of North Korean forces into the south Task Force Smith was deployed to the Korean front from Japan. Task Force Smith consisted of U.S. Army officers and regiments of the Army's 24th Infantry Division that were stationed in Japan as occupational forces. Unfortunately the 24th were under trained, poorly supplied, and outnumbered. The 24th offered very little resistance against the North Korean advance. American and South Korean troops were pushed south and in late July 1950 Task Force Smith was overrun in the city of Taejon. Troops from the Army's 25th Infantry Division were deployed to Taejon to establish a new line and pullout the decimated 24th I.D. This addition of combat troops did not stop the North Korean advance and both American and South Korean troops were pushed further south.
Document 14: Obaltan: The government banned "Obaltan" because of its unremittingly downbeat depiction of life in post-armistice South Korea. An American consultant to the Korean National Film Production Center saw the film and persuaded the government to release it in Seoul so that it might qualify for entry in the San Francisco International Film Festival. Director Yu Hyun-mok attended the film's premier in San Francisco in November 1963. "Variety" called "Obaltan" a "remarkable film", and noted that its "⁠[b]rilliantly detailed camera work is matched by probing sympathy and rich characterizations."
Document 15: Korean War: In the resulting Battle of Pusan Perimeter (August–September 1950), the U.S. Army withstood KPA attacks meant to capture the city at the Naktong Bulge, P'ohang-dong, and Taegu. The United States Air Force (USAF) interrupted KPA logistics with 40 daily ground support sorties that destroyed 32 bridges, halting most daytime road and rail traffic. KPA forces were forced to hide in tunnels by day and move only at night. To deny matériel to the KPA, the USAF destroyed logistics depots, petroleum refineries, and harbors, while the U.S. Navy air forces attacked transport hubs. Consequently, the over-extended KPA could not be supplied throughout the south. On 27 August, 67th Fighter Squadron aircraft mistakenly attacked facilities in Chinese territory and the Soviet Union called the UN Security Council's attention to China's complaint about the incident. The US proposed that a commission of India and Sweden determine what the US should pay in compensation but the Soviets vetoed the US proposal.
ground_truth: the Battle of Osan
sub_queries: Which was the country for Salangeul chajaseo? Answer: Korea
when did the us go to war with Korea Answer: the Battle of Osan