Episode 3 of 3

Alabama Territory Effective

Name: Alabama Territory Effective
Start: 1817-10-10
End: 1817-10-10
Location: Alabama Territory

When: October 10, 1817
Where: Alabama Territory
Part of: U.S. Congress splits the Mississippi Territory, creating the Alabama Territory

The Alabama Territory became effective on October 10, 1817, following the adoption of the Mississippi constitution, and the western half was admitted as a state in December.

Although designated in March, the Alabama Territory did not become effective until October 10, 1817. The Chattahoochee River played a significant role in the definition of the territory's borders during its brief two-year existence from 1817 to 1819. The western portion of the Mississippi Territory was separately admitted to the Union as the State of Mississippi on December 10, 1817, completing the division.

Sources

Alabama Territory Wikipedia, revision of 2025-11-13
Mississippi Territory Wikipedia, revision of 2026-09-29

Machine-drafted from the cited Wikipedia passages and checked by a reviewing model, not by a human editor. Every passage cites the revision it was written from; dates and places follow those passages.