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The assassination of the heir to the Austria-Hungary throne led to the declaration of World War I.
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The Zimmerman telegram being released pushed America into joining World War 1.
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The Great Depression was a time of economic downturn lasting ten years.
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On December 12, 1941 Japan bombs Pearl Harbor leading America to join World War II.
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Japan surrendered after the bombing of Hiroshima and Nagasaki.
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The holocaust was the systematic genocide of European Jews during World War II.
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On August 21, 1959 President Eisenhower signed a proclamation admitting Hawaii as the 50th state.
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America's Apollo mission wins them the space race.
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Dr. King's "I have a Dream Speech" led to the creation of the Civil Rights Act of 1964 and the Voting Rights Act of 1965.
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The fall of the Berlin Wall led to the fall of the Union of Soviet Socialist Republic.