MississippiTerritory was a historic, organized territory of the United States from April 7, 1798, and expanded twice (in 1804 and 1812), until it extended from the Gulf of Mexico to the southern border of Tennessee.
The MississippiTerritory was organized in 1798 from land that had been disputed by the U.S. and Spain until Spain ceded claim with Treaty of Madrid in 1795.
In 1817 the MississippiTerritory was divided, when the western portion became the state of Mississippi, and the eastern became the AlabamaTerritory, with St.