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Animated map of the contiguous 48 States showing every country boundary change from 1629 onwards, and State border changes from 1784.
Year and Month are shown in the top right hand corner.
Note: Grey coloured areas are independent regions that would later become part of the States.
Map data: Atlas of Historical County Boundaries, The Newberry Library: Creative Commons by-nc-sa/2.5
Music: Pitx 'Black Rainbow' - Licensed under Creative Commons Sampling Plus. http://ccmixter.org