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Geography 16 Online
OpenStudy (marysammonss):

http://www.usatestprep.com/modules/gallery/files/132/13235/13235.jpg What would have been the BIGGEST obstacle to keep people from traveling freely between points 1 and 2 on this map during the mid-1800s? A) the Great Plains B) the Missouri River C) the Rocky Mountains D) the Appalachian Mountains

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