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The Post Office Department (1792–1971) was the predecessor of the United States Postal Service, in the form of a Cabinet department officially from 1872 to 1971. It was headed by the Postmaster General.
The Post Office Department (1792–1971) was the predecessor of the United States Postal Service, in the form of a Cabinet department officially from 1872 to 1971. It was headed by the Postmaster General.