Uncle Sam

Established in 1812 as a symbol of U.S. government and American patriotism.
Generally believed the name came from businessman Samuel Wilson, who supplied beef to the Army and whose nickname initials “U.S.” were stamped on the barrels.
His present “look” became standard during World War I in the famous “I want YOU for the U.S. Army” recruitment poster.
The symbol is regularly used across popular culture in sports, film, music, and literature.