[muawiyah]

You'll find, if you bother to look, the entity known as the United States Postal Service began operation on July 1, 1971.

See: http://www.usps.com/history/history/his3.htm#SERVICE

[swmobuffalo]

“You’ll find, if you bother to look, the entity known as the United States Postal Service began operation on July 1, 1971.”

Actually, I don’t care. There has been a postal service since the inception of the country by whatever name.