- 
  
  Archduke of Austria-Hungary was shot and killed by Gavrilo Princip. This event is considered the spark for WWI.
- 
  
  Germany declares war on Russia. France and Belgium begin full mobilization.
- 
  
  Great Britain declares war on Germany.
- 
  
  The British Passenger Ship, sailing from New York to Liverpool, was torpedoed by a German U-boat. The boat sank with it killing 1,195 and 123 of those, Americans. The incident created sharp reactions from the Americans and this led to Theodor Rosevelt entering the War.
- 
  
  The first use of tanks on the battlefield was the use of British Mark I tanks at the Battle of Flers-Courcelette (part of the Battle of the Somme) on 15 September 1916, with mixed results; many broke down, but nearly a third succeeded in breaking through.
- 
  
  Democrat Woodrow Wilson was elected as the President of the United States of America in November 7, 1916.
- 
  
  The United States of America receive note that shows a proposed alliance between Germany and Mexico.
- 
  
  
- 
  
  Wilson went to Congress and asked for a declaration of War
- 
  
  In June 15,1917, Congress passed the Espionage Act. ... Congress passed the Sedition Act of 1918, which made it a federal offense to use "disloyal, profane, scurrilous, or abusive language" about the Constitution, the government, the American uniform, or the flag.
- 
  
  In 1918, The Spanish Influenza or also called " La Grippe " was spreading. It ultimately infected 500 million people around the world, including 675/00 Americans. This first case was a company cook, Albert Gitchell, he was the first one with the Spanish Influenza.
- 
  
  Armistice Day is on November 11, it's to make the armistice signed between the Allies of WWI and Germany.