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U.S. History
Period 1: 1491–1607
Period 2: 1607–1754
Period 3: 1754–1800
Period 4: 1800–1848
Period 5: 1844–1877
Period 6: 1865–1898
Period 7: 1890–1945
Period 8: 1945–1980
Period 9: 1980–Present
9.2: Reagan and Conservatism
9.3: The End of the Cold War
9.4: A Changing Economy
9.5: Migration and Immigration in the 1990s and 2000s
9.6: Challenges of the 21st Century
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U.S. History
Period 9: 1980–Present
9.6: Challenges of the 21st Century
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9.6: Challenges of the 21st Century
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