World War 1 to World War 2 By timhanhd Period: Jul 28, 1914 to Nov 11, 1918 World War 1 Period: Jan 1, 1920 to Dec 31, 1929 The Roaring Twenties Aug 18, 1920 American women have the right to vote Aug 26, 1920 Amelia Earharts first flight Period: Aug 26, 1920 to Aug 27, 1929 The Roaring Twenties Oct 26, 1920 Amelia Earhart first flies Jul 30, 1921 Insulin is discovered Aug 26, 1921 Insulin is discovered Period: Jun 17, 1928 to Jun 18, 1928 Amelia Earhart flies over the Atlantic Aug 26, 1928 Penicilin is discovered Sep 28, 1928 Penicilin is discovered Period: Oct 19, 1929 to Aug 27, 1939 The Depression Period: Oct 19, 1929 to Dec 31, 1939 The Depression Aug 19, 1934 Adolf Hitler officially voted as Fuhrer of Germany May 6, 1937 The Hindenburg Disaster Period: Sep 1, 1939 to Sep 2, 1945 World War 2