The U.S got involved in The Korean War and Vietnam for many reasons. The U.S got involved in the Korean War because the United Nations called upon all member countries to help support South Korea. The United States had a relationship and treaties with South Vietnam so when the North attacked it was our duty to honor our relationship.
North Korea & North Vietnam.
Australia, New Zealand, Thailand, South Korea and the Philippenes.
North Vietnam=Air War South Vietnam=Ground & Riverine War
The US fought in Korea to stop the Soviet Union from spreading communism. This was between 1950 and 1953. It was a predecessor to the Vietnam war which occurred between 1955 and 1975. Both times the US intervened in order to stop the commmunist states, North Korea and North Vietnam from taking control of the rest of the capitalist democratic states of South Korea and South Vietnam.
Other than Military Operations; since WW2, Korea & Vietnam.
Vietnam, Korea, China (in Korean War) and they backed the Bay of Pigs Invasion into Cuba.
In the Vietnam War the US opposed the invasion of South Korea by North Korea. The fighters from North Korea, who used guerilla tactics, were known as the Viet Cong.
North Korea
Vietnam and Korea .
South Korea
The popular support for Cold War theories was weakened by the outcome of the Vietnam war. It had also weakened the moral of the US military.
Trying to stop communist aggression.