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this was a time when half of the Mississippi river was purchased by from France by the United States up to ( 828,000 ) acres.

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The United States wanted to push thousands of Native American tribes from east of the Mississippi river.

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Lewis and Clark Expedition ( May 14, 1804 )

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Lewis and Clark Expedition ( May 14, 1804 )

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Lewis and Clark headed out on a boat with 50 soldiers and 1 native American interrupter to explore many central american states.

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This was a group of American fur trappers that went to these mountains and moved in to kill animals and explore also kicking out the Natives that where there first.

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Rapid influx or gold/ fortune seekers that came to Sacramento to find gold at the Sutter's Mills in early 1848 reached peak in 1852.

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The Homestead Act, enacted during the Civil War in 1862, provided that any adult citizen, or intended citizen, who had never borne arms against the U.S. government could claim 160 acres of surveyed government land. Claimants were required to live on and “improve” their plot by cultivating the land.

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U.S. Census announced that rapid western settlement meant that "there can hardly be said to be a frontier line." In just a quarter century, the far western frontier had been settled. Three million families started farms on the Great Plains during these years.