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| YEAR | DATE | EVENT | PRESIDENT |
| 1886 | Spanish colony | ||
| 1899 | Part of German New Guinea | ||
| 1914 | Japan occupation | ||
| 1920 | 17 december | Japan Trust administration | |
| 1944 | september | U.S. occupation | |
| 1947 | 18 july | USA Trust administration | |
| 1981 | 1 january | USA associated Republic under Trust administration | Haruo Ignacio Remeliik |
| 1985 | 30 june | Thomas Ongelibel Remengesau (I) | |
| 1985 | 2 july | Alfonso Rebohong Oiterong | |
| 1985 | 25 october | Lazarus Eitaro Salii | |
| 1988 | 20 august | Thomas Ongelibel Remengesau (II) | |
| 1989 | 1 january | Ngiratkel Etpison | |
| 1993 | 1 january | Kuniwo Nakamura | |
| 1994 | 1 october | Republic | Kuniwo Nakamura |
| 2001 | 1 january | Thomas "Tommy" Esang Remengesau (I) | |
| 2009 | 15 january | Johnson Toribiong | |
| 2013 | 17 january | Thomas "Tommy" Esang Remengesau (II) | |
| 2020 | 3 november | Surangel Whipps, Jr |