The Marshall Plan (officially the European Recovery Program, ERP) was an American initiative to aid Western Europe, in which the United States gave over $12 billion (nearly $100 billion in 2016 US dollars) in economic assistance to help rebuild Western European economies after the end of World War II.
“The United States should help free nations resist the spread of communism” best describes a belief held by President Truman that led to the establishment of the Truman Doctrine.
The Truman doctrine’s main purpose is for the United States to help in opposing the spread communist ideals around the world.