- 
  
  
        Theodore Roosevelt becomes President - 
  
  
        Pure Food and Drug Act - 
  
  
        Election of Woodrow Wilson - 
  
  
        Sixteen Amendment authorizing income tax ratified. - 
  
  
        Seventeenth Amendment providing for direct elections of Senators ratified - 
  
  
        World War 1 begins - 
  
  
        U. S. troops sent to Haiti - 
  
  
        Lusitania was torpedoed by German U-boat. - 
  
  
        U.S. enters WW1 due to the sinking of the Lusitania. - 
  
  
        WW1 ends - 
  
  
        Eighteenth Amendment prohibits alcoholic beverages - 
  
  
        Nineteenth Amendment gives women the right to vote.