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| YEAR | DATE | EVENT | GOVERNOR |
| 1804 | Part of Louisiana | ||
| 1812 | 7 december | Part of Missouri | |
| 1819 | 2 march | U.S. territory | James Miller |
| 1825 | 4 march | George Izard | |
| 1829 | 9 march | John Pope | |
| 1835 | 9 march | William S. Fulton | |
| 1836 | 15 june | 25^ state of USA | |
| 1861 | 6 may | Secession | |
| 1861 | 20 may | 8^ State of Confederate States of America | |
| 1868 | 22 june | Reunion to U.S.A. |