Question

Which of the following best describes the reason the United States became involved in Vietnam? a. South Vietnam had no army of its own. b. Lyndon Johnson was determined to keep South Vietnam from falling to the Communists. c. Vietnam was a foothold on the Asian continent to invade the Soviet Union. d. Lyndon Johnson was protecting Vietnam from brutal Japanese rule.

Answer 1

b. Lyndon Johnson was determined to keep South Vietnam from falling to the Communists. The U.S. intervention was driven by Cold War containment policy and the "domino theory"—preventing communist expansion in Southeast Asia.