- Year of entrance into the Union
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13 Founder States, i.e.
Delaware
Pennsylvania
New Jersey
Georgia
Connecticut
Massachusetts
Maryland
South Carolina
New Hampshire
Virginia
New York
North Carolina
Rhode Island
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Territorial acquisitions according to the Treaty of Versailles in 1783
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Territories ceded to France in 1803
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Mexican territories annexed in 1845
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Territories given by Great Britain in 1846
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Territories lost by Mexico in 1848-1853