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This greatly expanded the territory of the United States of American, giving reason to push the frontier even farther west.
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Illustrates the romanticized and often religious view of the West by European settlers.
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This provided even more land for expansion. The frontier pushed on, consuming more land.
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Once again, this purchase added even more land to the US, and allowed for the frontier's expansion not only west, but also north.
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Illustrates the destruction done by frontier expansion.
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Parallels the savagery of frontier life in a survival of the fittest world.