Boxing is a combat sport that involves two people throwing punches at each other while wearing gloves in a boxing ring. It has a long history dating back to 4000 BC in North Africa and was also popular in ancient Greece and Rome. The first documented boxing matches in Britain took place in the 17th century. Key rules for boxing were established in the 18th century. Some of the most famous boxers include Jack Johnson, the first African American heavyweight champion in the early 20th century, and Joe Louis who was known as the "Brown Bomber" and considered an American icon. Professional boxers can earn salaries ranging from a few hundred dollars for early fights up to millions of dollars per year or fight for top boxers like