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| YEAR | DATE | EVENT | EMPEROR | PRIME MINISTER | GENERAL GOVERNOR |
| 1945 | 2 september | U.S. Occupation | gen. Douglas MacArthur | ||
| 1945 | 8 october | Baron Kijuro Shidehara | |||
| 1946 | 20 may | Shigeru Yoshida (I) | |||
| 1947 | 21 may | Tetsu Katayama | |||
| 1948 | 23 february | Hitoshi Ashida | |||
| 1948 | 15 october | Shigeru Yoshida (II) | |||
| 1951 | 11 april | Matthew Bunker Ridgway |