answersLogoWhite

0

The U.S. actively joined WWI in 1917 with a declaration of war on April 6. The United States involvement in the war, however, essentially began in 1915 with the sinking of the British liner Lusitania and the loss of many American lives. An additional incident occurred in January 1917, when the German government secretly requested the Mexican government to join with them in attacking America.

User Avatar

Wiki User

15y ago

What else can I help you with?