A massive dynamite bomb destroys the Los Angeles Times building in downtown Los Angeles, California, killing 21 people. Police arrest James B. McNamara and his brother John J. McNamara. Though the brothers are represented by the era's most famous lawyer, Clarence Darrow, of Scopes Monkey Trial fame, they eventually plead guilty. James is convicted and sentenced to fifteen years in prison. His brother John is convicted of a separate bombing of the Llewellyn Iron Works and also sent to prison.

In the Philippines, an epic heavyweight boxing match known as the Thrilla in Manila takes place between Muhammad Ali and Joe Frazier. It is the third, final and most brutal match between the two, and Ali wins by TKO in the fourteenth round.

American actor James Dean, who appeared in the films Giant, East of Eden, and the iconic Rebel without a Cause, dies in an auto accident at age 24 when his Porsche 550 Spyder is hit head-on by a larger Ford coupe. The driver of the Ford had been trying to make a left turn across the rural highway U.S. Route 466 and never saw Dean's small sports car approaching.

Mexican-American farm worker César Chávez founds the United Farm Workers in California. His strikes, marches and boycotts eventually result in improved working conditions for manual farm laborers and today his birthday is celebrated as a holiday in eight U.S. states.

American industrialist John D. Rockefeller becomes America's first billionaire. His Standard Oil Company had gained near total control of the U.S. petroleum market until being broken up by anti-trust legislators in 1911. Afterward, Rockefeller used his fortune mainly for philanthropy, and had a major effect on medicine, education, and scientific research.