From Wikipedia: The United States Postal Service (USPS), (also known as the Post Office, U.S. Mail, or Postal Service), is an independent agency of the United

From Wikipedia: The United States Postal Service (USPS), (also known as the Post Office, U.S. Mail, or Postal Service), is an independent agency of the United States government responsible for providing postal service in the United States. It is one of the few government agencies explicitly authorized by the United States Constitution.