This map depicts Britain's Thirteen Colonies in America, between 1763 and 1775. By the end of that time frame, the population numbered approximately 2.5 million. Most people lived east of the Allegheny Mountains.
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Map from Historical Atlas by William R. Shepherd, New York, Henry Holt and Company, 1923.
Online, courtesy Perry-Castañeda Library Map Collection, University of Texas at Austin.