We will support any country fighting against communism!
We will aid Western European countries to rebuild their economies!
The US policy of containment focused on stopping the spread of communism to other European countries instead of trying to stop it where it already existed.
Truman declared that America would support any country fighting communism, marking the start of the policy of containment
George Marshall proposed that aid be given to western European countries to rebuild their economies, to create good will towards the United States and to prevent these countries from turning to communism when they were desperate and miserable.
The US, Canada and Western Europe form NATO in 1949 based on the concept of collective security, the US tries to contain communism by forming a treaty and protecting countries in Western Europe from communist influence.
After communist North Korea invaded South Korea, President Truman came to the aid of South Korea and sent U.S. forces into the conflict. This is an example of containment because the US got involved in a war to stop communism from spreading to another country.
After communist North Vietnam invaded South Vietnam, the US sent over troops to Vietnam in 1950. This is an example of containment because the US got involved in another war just to keep communism from spreading.