Period of Progress or Decline By Dante.D Jun 28, 1914 The start of WW1 Period: Jun 28, 1914 to Dec 31, 1929 Period of Progress or Decline Jan 19, 1915 The First German Zeplin Raid Mar 1, 1916 Germany Begins Attacking Ships in The Atlantic Apr 6, 1917 The United States of America Declares War on Germany Nov 11, 1918 The End of WWI Apr 10, 1919 The Quebec referendum on the prohibition of alcohol Jan 10, 1920 Canada Joins The League of Nations Jul 27, 1921 Frederick Banting Discovers Insulin Jan 11, 1922 The First Successful Insulin Treatment is Made Jan 10, 1929 Lomer Gouin Becomes Quebec's 15th Lieutenant
