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Marshall Plan, Truman doctrine and I guess you could include the Eisenhower Doctrine as well.
Some people opposed the Truman Doctrine because the plan ultimately ended up reversing the government's earlier decision not to get involved in European affairs. Many people wanted the U.S. to mind it's own business so as not to get involved in another war.
Communism ;)
fight the spread of communism aid nations that were in danger of becoming communist
George F. Kennan, toward the Truman doctrine