July 4, 1910 – Reno, Nevada, US.

In a heated boxing match dubbed “Fight of the Century,” Jack Johnson, the first African-American heavyweight champion, defeated James J. Jeffries, the retired white boxer champion.
Johnson’s victory dismayed white spectators of the match, who began attacking the black spectators. 
The fight between the two boxers’ supporters sparked racial riots in over 15 cities like wildfire. 
In two days, more than 20 people lost their lives in the riots, with hundreds injured.
It was the first nationwide racial riot in America.