What made American invade Vietnam?

Answer 1

The American invasion of Vietnam was primarily driven by the desire to contain the spread of communism during the Cold War, a policy known as the Domino Theory. U.S. leaders feared that if Vietnam fell to communism, neighboring countries in Southeast Asia would also succumb, threatening U.S. interests and allies in the region. Additionally, the U.S. aimed to support the South Vietnamese government against the communist North, which was backed by the Soviet Union and China. This escalation ultimately led to increased military involvement, culminating in full-scale war by the mid-1960s.