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There were more than 5,00,000 US troops in Vietnam by 1969.
What happened in Vietnam in 1969?
The Vietnam War, which lasted from 1954 to 1975, was a protracted battle between the governments of South Vietnam and its main ally, the United States, and the communist government of North Vietnam and its allies in South Vietnam, known as the Viet Cong. The conflict in Vietnam, also known as the "American War" (or, in full, the "War Against the Americans to Save the Nation"), was a manifestation of the Cold War between the United States and the Soviet Union, as well as their allies, and was also a part of a larger regional conflict (see Indochina wars).
What was facts about US troops?
North Vietnam's aim to unite the entire nation under a single communist dictatorship based on those of the Soviet Union and China, which had overthrown the French colonial administration of Vietnam in 1954, was at the core of the struggle. On the other side, the administration of South Vietnam tried to maintain a Vietnam that was more closely associated with the West. Initially deployed in modest numbers during the 1950s, American military advisors were widely implemented starting in 1961, and active combat forces were added in 1965. More over 500,000 Americans were serving in the military in Vietnam by 1969.
The North, in turn, provided backing, political guidance, and regular combat soldiers for the battle in the South as the Soviet Union and China poured weapons, supplies, and advisers into the region. By 1973, all American combat units had left the country due to the mounting expenses and casualties of the conflict. The North's full-scale invasion of South Vietnam in 1975 resulted in its collapse.
Supporting answer
Hence option C is correct answer
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