5. Vietnam War, 1959-1975 In its zeal to root out Communism in Southeast Asia, the US invaded Vietnam, and propped a stooge government to take on the Viet Cong, aided by Soviet Union and China.
The US military involvement in Vietnam has been said to be one of the worst mistakes of in U.S history.
After a long drawn war, the Americans had to withdraw handing over Vietnam to the Communists led by Ho Chi Minh and his associates.
The US and its allies lost approximately 60,000 army personnel in the process.