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The Trail of Tears was an ethnic cleansing and forced displacement of approximately 60,000 people of the "Five Civilized Tribes" between 1830 and 1850
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By connecting the existing eastern U.S. rail networks to the west coast, the Transcontinental Railroad (known originally as the "Pacific Railroad") became the first continuous railroad line across the United States
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The Spanish-American War of 1898 ended Spain's colonial empire in the Western Hemisphere and secured the position of the United States as a Pacific power.