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The modern U.S. Postal Service was established on July 1, 1971 through the Postal Reorganization Act of 1970. This new act made the postal service a fully independent entity within the Executive branch of the federal government. Prior to 1971, the U.S. Postal Service had been a department of the Cabinet since 1872.
The U.S. Postal Service emphasizes in their marketing that they are continually improving and will be able to provide even better mail services in both the present and the future.