Alabama was mostly territory claimed by the English, and was considered part of the Georgia colony. The Gulf Coast part was also claimed by Spain at one point.
The U.S. has never owned Canada.
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The colony of South Carolina was "owned" by the British - before the Revolutionary War ended in victory for the U.S. in 1981.
Columbia owned the area around Panama before the US helped Panama form its own country.
Florida has a higher percentage of federally owned land compared to Alabama and Georgia. Approximately 28% of Florida's land is federally owned, largely due to national parks, forests, and wildlife refuges. In contrast, Alabama and Georgia have significantly lower percentages of federally owned land, with Alabama around 5% and Georgia about 7%.
There were thousands of people who owned slaves in the state of Alabama prior to the end of slavery. The slaves were used for manual labor on their farms.