Here are the matches for each definition:
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Domino Theory - idea that if a nation falls under communist control, nearby nations will also fall under communist control.
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G.I Bill - a name given to the Servicemen's Readjustment Act, a 1944 law that provided financial and educational benefits for World War II veterans. Helped build the middle class.
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Containment - policy adopted by the United States in the late 1940s to stop the spread of communism.
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Communism - In theory, an economic and political system based on one-party government, state ownership of property, and no economic classes.
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Democracy - a government run by the people. Each citizen has a say (or vote) in how the government is run.