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When the United States declared its independence in 1776 it was only one fourth its present size. By negotiation, purchase, annexation, and war it extended its boundaries from the Atlantic to the Pacific by 1853. This map shows the acquisitions and the dates the areas were added.
United States: expansion. Image. Britannica School, Encyclopædia Britannica, 1 Nov. 2017. school.eb.com/levels/elementary/assembly/view/54612. Accessed 27 Nov. 2017.