The acronym "USPS" refers to the United States Postal Service. It has been in existence since July 26, 1775, when the Second Continental Congress created it. Benjamin Franklin was the first Postmaster General of the United States.
As of 2013, the USPS delivered mail and packages to over 153 million addresses throughout the United States. It had a total of 626,764 employees and handled in excess of 158 billion pieces of mail in 2013.
The USPS functions as a semi-independent government agency. It has not used any taxpayer funding to run its operations since 1982. It relies solely on the revenues that it generates from postage.