Answer:
[a] The Korean War was a conflict that lasted from 1950 to 1953 between North Korea and South Korea, with the involvement of China, the Soviet Union, the United States and other countries. The war began when North Korea invaded South Korea on June 25, 1950, following a series of clashes along the border and political tensions. The United Nations, led by the United States, intervened on behalf of South Korea, while China and the Soviet Union supported North Korea. The war was fought along a fluctuating front line that roughly followed the 38th parallel, which divided Korea before the war. The war ended with an armistice on July 27, 1953, that restored the prewar boundary and created a demilitarized zone between the two Koreas. The war resulted in an estimated 2.5 million civilian and military casualties, as well as political and social changes in Korea and the world.
[b] The Vietnam War was a conflict that lasted from 1954 to 1975 between North Vietnam and South Vietnam, with the involvement of China, the Soviet Union, the United States and other countries. The war was part of a larger struggle between communism and capitalism in Southeast Asia. The war began after the Geneva Conference of 1954, which divided Vietnam into two states along the 17th parallel, following the defeat of French colonial forces by the Viet Minh, a communist-led nationalist movement. The United States supported South Vietnam against the Viet Cong, a communist guerrilla force that operated in South Vietnam with the aid of North Vietnam. China and the Soviet Union supported North Vietnam against South Vietnam and its allies. The war was fought on land, air, and sea, as well as in neighboring countries such as Laos and Cambodia. The war ended with the Paris Peace Accords of 1973, which established a ceasefire and a withdrawal of U.S. forces from Vietnam. However, the fighting resumed in 1975, when North Vietnam launched a final offensive that captured Saigon, the capital of South Vietnam, on April 30. The war resulted in an estimated 3 million civilian and military casualties, as well as political and social changes in Vietnam and the world.