On 4 July, 1910, in 100-degree heat at an outdoor boxing ring near Reno, Nevada, film cameras recorded-and thousands of fans witnessed-former heavyweight champion Jim Jeffries' reluctant return from retirement to fight Jack Johnson, a black man. After 14 grueling rounds, Johnson knocked out Jeffries and for the first time in history, there was a black heavyweight champion of the world. At least 10 people lost their lives because of Johnson's victory...