Maybe a good metric would be when we are no longer taking military action.
Anyway, here's a
Germany timeline for comparison purposes:
May 8, 1945 - Unconditional surrender.
Allies (US, UK, USSR, France) occupy and administer country.
September 21, 1949 - Self government with exceptions.
May 1955 - Full Sovereignty with exceptions (oxymoron?)
December 2, 1990 - First all-German elections, as part of unification.