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  The Yalta Conference was held to discuss the plans for peace. This was ultimately for what to do with postwar Europe.
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  This conference was between the Soviet Union and the other allies. They could not find an agreement as a result.
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  This was a pledge to provide economic and military aid to oppose the spread of Communism. This was established by president Truman.
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  The Marshall plan was a massive program of economic aid. This was named after George Marshall, the U.S. secretary.
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  The Berlin airlift was a massive effort to supply West Berlin by air. This was a success.
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  The NATO was designed to counter Soviet power in Europe. This was joined by the United, Canada, and most of Western Europe.
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  The Soviet Union explodes its first atomic bomb which was successful. This threatened the west.
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  The North Koreans attacked South Korea. Their goal was to unite the country under a communist government.
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  The Warsaw pact was created by the Soviet Union and the Communist nations of Easter Europe. They wanted to form their own alliance.
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  The launch of this first artificial satellite was another leap in the Soviet Union's success. This threatened to the U.S. that the Soviet military could be ahead of theirs.
