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- TrackingWriters, HistoryOf.
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- "The existence of an area of free land, its continuous recession, and the advance of American settlement westward explain American development."
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- * FrancisParkman
- * TheodoreRoosevelt
- * AmericanNationalism
- * [http://www.pbs.org/weta/thewest/people/s_z/turner.htm PBS - THE WEST]
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- http://www.pbs.org/weta/thewest/people/images/turner.jpg
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