1971
Gold window closes
15 August: the United States suspends dollar–gold convertibility for foreign officials.

On 15 August 1971 the United States stopped converting dollars into gold for foreign official holders. That was the last official gold contract on the post-war dollar.
Private Americans had already been barred from monetary gold since the 1933 recall. 1971 did not invent fiat in one night. It ended that remaining official link.