1921-1941 By SGilreath0409 1921 Emergency Quota Act 1924 Revenue Act 1925 The Scopes Trial 1926 NBC founded as the U.S.'s first major broadcast network 1929 American Samoa officially becomes a U.S. territory 1929 The U.S. Stock Market Crash 1933 End of Prohibition 1939 World War II begins 1941 The bombing of Pearl Harbor 1941 Russia enters World War II