On July 24, 1925, John Scopes was found guilty of teaching evolution in a Tennessee high school, contrary to a state statute. Learn more about the Scopes Monkey Trial.

On July 24, 1929, the Kellogg-Briand Pact took effect, renouncing war as an instrument of foreign policy. It had been previously signed on August 27, 1928 by most great world powers. World War II broke out in Europe ten years after the treaty was signed. Read documents related to the Kellog-Braid Pact from Yale Law School's Avalon Project.