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| YEAR | DATE | EVENT | GOVERNOR |
| 1659 | Spanish colony | ||
| 1899 | Part of German New Guinea | ||
| 1914 | 3 october | Japan occupation | |
| 1920 | 17 december | Japan Trust administration | |
| 1944 | U.S. occupation | ||
| 1947 | 18 july | USA Trust administration | Louis Emil Denfeld |
| 1948 | 17 april | DeWitt Clinton Ramsey | |
| 1949 | 1 may | Arthur William Radford | |
| 1951 | 6 january | Elbert Duncan Thomas | |
| 1953 | 13 march | Frank Elbert Midkiff | |
| 1954 | 1 september | Delmas Henry Nucker | |
| 1961 | 1 may | Maurice Wilfrid Goding |
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| YEAR | DATE | EVENT | GOVERNOR |
| 1962 | 24 october | Federation of Micronesia | |
| 1966 | 27 may | William Robert Norwood | |
| 1969 | 1 may | William Robert Norwood | |
| 1976 | 1 july | Peter Tali Coleman | |
| 1977 | 9 july | Adrian P. Winkel | |
| 1979 | 10 may | Autonomy | |
| 1981 | Janet J. McCoy |
| YEAR | DATE | EVENT | PRESIDENT |
| 1986 | 3 november | End of Trust territory | Tosiwo Nakayama |
| 1987 | 15 may | John Haglelgam |