Map of U.S. Territorial Growth (1850) from the Perry-Castañeda Library Map Collection, "...the maps scanned by the University of Texas Libraries and served from this web site are in the public domain. No permissions are needed to copy them. You may download them and use them as you wish."
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Map of U.S. Territorial Growth (1850) from the Perry-Castañeda Library Map Collection. This image can be found at [http://www.lib.utexas.edu/maps/united_states/us_terr_1850.jpg].