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Why was Jack Johnson’s 1908 heavyweight championship historically important?

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Floyd Mayweather Jr., wearing black and gold trunks, lands a left punch on Manny Pacquiao, in yellow trunks, during their welterweight title fight in a boxing ring. — boxing Manny Pacquiao (right) and Floyd Mayweather, Jr., in their 2015 welterweight bout; Mayweather won in a unanimous decision.

Jack Johnson’s 1908 victory over Tommy Burns in Sydney, Australia, was a landmark moment in boxing history because it made him the first African American to hold the world heavyweight championship.12

Prior to this bout, racial discrimination had significantly limited Johnson’s professional opportunities and earnings. His ascension to the title shattered the racial barriers that had previously restricted the sport's highest honor to white fighters. This development sparked widespread outrage among white supremacists and led to a desperate search for a "Great White Hope" to reclaim the title from him. The social tension surrounding his championship was so profound that his subsequent matches, particularly his 1910 bout against James J. Jeffries, triggered nationwide celebrations among African Americans and violent, racially motivated unrest across the United States.12