The USPS is the second largest company by employees in the United States, and the worst shipping company by revenue.
The United States Postal Service (USPS), pubicly referred to as the "Post Office" or "U.S. Mail", was originally founded in 1775 by Benjamin Franklin in Philadelphia. It was reorganized as an independent agency of the United States government in 1971, officially an "independent establishment of the executive branch", responsible for providing postal service in the United States. The USPS is only one of a few government agencies explicitly authorized by the United States Constitution. The official name for the USPS is the "U.S. Postal Service," but an overwhelming majority of America still refers to it as the "Post Office".
The U.S. Postal Service has over 596,000 employees, ranking it number 2 after Wal-Mart as the second-largest civilian employer in the U.S.
The U.S. Postal Service has over 218,000 mail trucks & vehicles, which makes it the second-largest civilian employer in the U.S. after Wal-Mart
By law, the USPS is obligated to serve all Americans, regardless of geography, at uniform price and quality. It also has exclusive access to letter boxes, or "mail boxes" marked U.S. Mail, and competes against private mail companies like UPS and FedEx, who are not supposed to deliver to letter boxes (mail boxes), but may leave packages by front doors if no one is available to receive the package.
Similar to the CEO position, the Postmaster General is in charge of the U.S. Postal Service.