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American westward expansion began with the english colonial settlements in the early 17th century.
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"7 year war"
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American Revolutionary War
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Cupid and Psyche painting by Benjamin West.
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Monroe doctrine
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Mexican American War
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The Backwoods of America painting by Jasper Francis Cropsey.
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Elihu Vedder painted Young Marsyas.
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The American frontier movement ended with the admission of the last mainland territories as states in 1912.