Nazi Holocaust: 1939 - 1945
War crimes trials: Fall 1945
DR Congo genocide: 1996-1997
War crimes trials: Still thinking about it.
I guess that brackets the range of potential variation.
(Note: This does not refer to the other, related genocide of Tutsi, for which trials have taken place.)
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Events
Never before have we had so little time in which to do so much.
- Franklin Delano Roosevelt, 1882 - 1945