The first African American to win the world heavyweight championship, Jack Johnson (1878-1946) was the preeminent American sports personality of his era. Holder of the title from 1908 to 1915, Johnson continued to box professionally until he was in his 60s. His 1910 victory over the formerly undefeated champion James J. Jeffries in "The Fight of the Century" triggered race riots across the country, and racial bias fueled the clamor for his defeat...