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ACT
Here's a map to show you when states were added to the Union. It also shows territories and when they were acquired.
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florida acquisitions, gadsden purchase, louisiana purchase, mexican cession, oregon country, perry-castaneda map collection: admission of states and territorial acquisitions, texas annexation, u. s. history through maps, u. s. territorial expansion, university of texas at austin, boundaries of united states, boundaries of territories of united states, map of united states, states added to the union, thirteen original states