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The Louisiana Purchase was a land deal between the United States and France
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their mission was to explore the territory, establish trade with the Natives and affirm the United States in the region.
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U.S. President James K. Polk oversaw the best territorial expansion of the United States to date.
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An war between mexico and the U.S for territory
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James W. Marshall found shiny metal in the tailrace of a lumber mill Marshall was building for Sutter on the American River.
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encouraged Western migration by providing settlers 160 acres of public land.
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americs stoped expanding west