William Harrison "Jack" Dempsey ("The Manassa Mauler") (June 24, 1895 – May 31, 1983) was an American

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 boxer

Boxing

Boxing, also called pugilism, is a combat sport in which two people fight each other using their fists. Boxing is supervised by a referee over a series of between one to three minute intervals called rounds...

 who held the world heavyweight title from 1919 to 1926. Dempsey's aggressive style and exceptional punching power made him one of the most popular boxers in history. Many of his fights set financial and attendance records, including the first million dollar gate.