Policies
100

The foundational U.S. policy aimed to prevent the spread of communism

Containment

200

Truman's 1947 policy to provide political, military, and economic assistance to democratic nations under threat from communist forces - specifically Greece and Turkey

the Truman Doctrine
300

Also known as the European Recovery Program, this provided economic assistance to rebuild Western European economies after World War II

the Marshall Plan

400

Also called the Treaty of Friendship, Cooperation and Mutual Assistance, this was a mutual defense alliance comprising Eastern European communist states

the Warsaw Pact 

500

Signed on April 4, 1949, this is the founding document that establishes a collective security alliance of 32 North American and European countries committed to mutual defense, peace, and democratic values.

the North Atlantic Treaty