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U.S. policy that gave military and economic aid to countries threatened by communism
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prohibits anyone who has been elected president twice from being elected again
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The Soviet Union blocked the Western Allies' railway, road, and canal access to the sectors of Berlin under Western control.
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Program to help European countries rebuild after World War II
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The North Atlantic Treaty Organization, also called the North Atlantic Alliance, is an intergovernmental military alliance between 30 European and North American countries.
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The Korean War was a war between North Korea and South Korea. The war began on 25 June 1950 when North Korea invaded South Korea following clashes along the border and insurrections in the south.
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Julius Rosenberg and Ethel Rosenberg were American citizens who were convicted of spying on behalf of the Soviet Union.
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The U.S. detonated the first hydrogen bomb, resulting in the first successful full-scale thermonuclear weapon explosion.
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Dr. Jonas Salk announces on a national radio show that he has successfully tested a vaccine against poliomyelitis, the virus that causes the crippling disease of polio.
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The Soviet Union launched the earth's first artificial satellite, Sputnik I. The successful launch came as a shock to experts and citizens in the United States, who had hoped that the United States would accomplish this scientific advancement first.
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