US involvement in the Cold War began with the Korean War. The war began on June 25, 1950 when North Korean troops entered the 38th parallel, which was the border established after World War II between North and South Korea. The North was supported by the Soviet Union and the People's Republic of China, while the South was later supported by the United States and its allies. Their attack was one of the first military measures of the Cold War (“Korean War”). Once North Korea invaded South Korea, the involvement of the United States took place to prevent the emergence of a new communist regime and their involvement contributed to several military developments and also left effects lasting politics and diplomacy during the Cold War. American involvement centered on American foreign policy at the time. Although war did not break out until June 1950, several conflicts arose following the attempt to retake the entire country under one regime for several years after World War II. The majority of these conflicts took place at the 38th parallel, where Korea was divided. Decisions influenced by President Harry S. Truman and his doctrine, which was essentially about containing the spread of communism, gave the United Nations the opportunity to prevent world domination by communism ("Teaching with Documents"). Fear of international communism from the powers of the Soviet Union and the People's Republic of China was the main reason for the United States to intervene. Besides preventing communism, President Truman's decision was also influenced by the environment of apprehension during the Cold Period. War. The Soviet Union managed to ruin the United States' monopoly on nuclear bombs in 1949 when they managed to detonate their first...... middle of paper...... of the War of Korea"). In conclusion, the decisive decision of the United States to enter the war was motivated by the desire to govern politically and, in essence, to prevent the global domination of the communist regime. The war also resulted in several major military advances, such as the use of helicopters as air ambulances and the National Blood Bank Program which changed the long-term handling of blood Technological advances in the Korean War, “while the Russians and the. Americans have invested heavily in technology to surpass themselves, both in the missile race and in the space race, ("Impact of the Korean War") have had an impact on various aspects of technology. , medicine and transportation The conflict also sparked the first "proxy war" of the Cold War, prolonged tensions with China and instead deepened them against the Soviet Union, which launched the Cold War with division. from Korea..