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Early American History (1776-1860)
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Civil War/Reconstruction (1860-1877)
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The Gilded Age (1877-1900)
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The Progressive Era (1890-1920)
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Imperialism (1898-1910)
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World War I (1914-1918)
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Roaring Twenties (1920-1929)
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Great Depression (1929-1939)
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World War II (1939-1945)
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United Nations formed
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Early Cold War (1945-1960)
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Truman Doctrine
U.S. policy that gave military and economic aid to countries threatened by communism -
22nd Amendment
prohibits anyone who has been elected president twice from being elected again -
Berlin Airlift
The Soviet Union blocked the Western Allies' railway, road, and canal access to the sectors of Berlin under Western control. -
Marshall Plan
Program to help European countries rebuild after World War II -
NATO established
The North Atlantic Treaty Organization, also called the North Atlantic Alliance, is an intergovernmental military alliance between 30 European and North American countries. -
Korean War
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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Civil Rights Era (1950-1970)
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Rosenbergs Trial
Julius Rosenberg and Ethel Rosenberg were American citizens who were convicted of spying on behalf of the Soviet Union. -
First H-Bomb detonated by the United States
The U.S. detonated the first hydrogen bomb, resulting in the first successful full-scale thermonuclear weapon explosion. -
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Vietnam War (1954-1976)
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Jonas Salk invents the Polio Vaccine
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. -
USSR launches Sputnik
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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End of the Cold War (1970-1991)
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1990s-21st Century (1990-2008)