Jack Johnson's journey as he attempted to win the heavyweight championship in boxing reflects what?

John (Jack) Johnson (1878 - 1946) was a boxer who became the first African American world heavyweight champion. Johnson won his first title in 1903, beating Denver Ed Martin in a match for the World Colored Heavyweight Champion. After that he won the World Heavyweight title from Tommy Burns (white Canadian) on Boxing Day 1908. In 1915 he lost his title to Jess Willard.

His boxing career reflects the racism in white society. Many white people felt humiliated by his victories.