- History of Alabama - Wikipedia
After being a part of the Mississippi Territory (1798–1817) and then the Alabama Territory (1817–1819), Congress admitted Alabama as a state on December 14, 1819
- Alabama - Native American, Civil War, Reconstruction | Britannica
Alabama was established as a separate territory in 1817 and became a state in 1819 By 1820 Alabama’s population was more than 125,000, including about 500 free Blacks By 1830 there were 300,000 residents, nearly one-fifth of them enslaved, and cotton was the principal cash crop
- Encyclopedia of Alabama
A free, comprehensive online reference work on the state of Alabama's history, culture, geography, and natural environment
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