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In 1801, Spain sighed a secret treaty with France to return Louisiana Territory to France.
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The Cherokee nation as forced to give up its lands east of the Mississippi River.
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Gold was first discovered in California by James Marshall at Sutter's Mills near the city Coloma.
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It allowed people in the territories of Kansas and Nebraska to decide for themselves.
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The Homestead Act encourage Western migration by providing settlers 160 acres of public land.
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With Smith surrender, last confederate army to exist, bringing a formal end to the bloodiest four years in the U.S history.
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Chief Joseph of the Nez Perce Indians surrenders to U.S. General Nelson A. Miles in the Bear Paw mountains.
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The Lewis and Clark Expedition, was the first expedition to cross what is now the western portion of the US.
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The Buffalo Soldiers formed on September 21, 1866 at Fort Leavenworth.