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Louis and Clark began their famous expedition in the summer of 1803, taking the Corps of Discovery to map the land and to take notes on the flaura and fuana of the area.
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The U.S. purchased the Louisiana Territory from France which caused Westward Expansion. This territory was 909,000 square miles of land, which nearly doubled the size of the nation.
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The United Stated joined in on the war against the British. The war ended in the August of 1815.
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The Oregon Trail began in 1843 (not sure of the exact date), it was a 6 month long journey over 2,000 miles of western American land.
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The Mexican American War was over land such as Texas California and land west of the past United States. This war lasted over 2 years in which Americans gained the new western territoy.
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This date marked the California Gold Rush when a man named John Sutter found a gold nugget in the American River. This caused many Americans and immigrants to travel to the west in search for gold.