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Indians were killed because the U.S. wanted to get rid of them. The U.S. wanted to take their land, so they had to take out the Indians.
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This war was between seven states that seceded from the U.S. This was caused by the election of Abraham Lincoln.
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This railroad connects the U.S. coast to coast. People could finally travel from one end to the other in the country.
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U.S. invaded the Black Hills because they thought that the Lakota weren't using the land very wisely, so the Americans took it. They wanted the gold that was inside the land.
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The Battle of Wounded Knee left a mark on the American History.