From the 1950s the Domino theory of geopolitics was prominent in U.S. From 1950 until 1954, the United States poured more than $3 billion into the war, bankrolling 'more than 80 percent of its material costs' over the four-year period. However, Stalin and Mao's offer of support to the Viet Minh changed the battlefield dynamic and geopolitical character from an independence struggle to part of the Cold War. was initially against providing aid to France in its struggle to maintain its colonial empire.

war with Japan in the Pacific, domestic pressure to act against communism after the communist victory in the Chinese Civil War, Joseph Stalin and Mao Zedong's pledge in 1950 to support the Viet Minh guerrilla forces in the First Indochina War against France's colonial rule, and the indecisive conclusion of the Korean War. involvement in Vietnam began due to a combination of factors: the U.S. By the conclusion of the United States's involvement in 1973, over 3.1 million Americans had been stationed in Vietnam. military presence peaked in April 1969, with 543,000 American combat troops stationed in Vietnam. United States involvement in the Vietnam War began shortly after the end of World War II in Asia, first in an extremely limited capacity and escalating over a period of 20 years.

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