The United States Postal Service, also known as the Post Office, U.S. Mail, or Postal Service, often abbreviated as USPS, is an independent agency of the United States federal government responsible for providing postal service in the United States. The USPS is the operator of the largest civilian vehicle fleet in the world.
The USPS is legally obligated to serve all Americans, regardless of geography, at uniform price and quality. The USPS has exclusive access to letter boxes marked “U.S. Mail” and personal letterboxes in the United States, but still competes against private package delivery services, such as UPS and has part use with FedEx Express
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