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When America bought Louisiana from the French.
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Louis and Clark explored, and was the first people ever to reach the Pacific Ocean by land.
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Louis and Clark explored and was the first people ever to reach the Pacific Ocean by land.
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The Natives found gold in Georgia and the Americans decide to kick them out of east and move them to the west.
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In a treaty between America and Great Britan resolved where the Canadian border was but didn't answer the question of Oregon territory.
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A treaty which ended the Mexican-American war and added an additional 525,000 acres of land of U.S. territory.