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Date: March 12, 1947

What happened: President Harry Truman announced a new U.S. foreign policy to support countries resisting communism, beginning with aid to Greece and Turkey.

How it shows containment: It was the first major step to contain Soviet influence by giving financial and military aid to stop the spread of communism.

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Date: June 5, 1947 (announced)

What happened: The U.S. gave over $12 billion in economic aid to rebuild Western Europe after WWII to prevent poverty and instability that could lead to communism.

How it shows containment: It helped stop communism by stabilizing economies and governments in Western Europe so they wouldn't turn to Soviet-style systems.

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Date: June 1948 – May 1949

What happened: The Soviet Union blocked all land routes into West Berlin, so the U.S. and its allies flew in food and supplies to keep the city alive.

How it shows containment: The airlift stopped Soviet attempts to force West Berlin to fall under communist control and proved the U.S. would defend its allies.

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The North Atlantic Treaty Organization (NATO)

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The North Atlantic Treaty Organization (NATO)

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Date: April 4, 1949

What happened: NATO was formed as a military alliance between the U.S., Canada, and Western European countries to protect against Soviet aggression.

How it shows containment: NATO was a collective defense strategy to deter Soviet attacks and keep communism from spreading in Europe.