1. Unrestricted submarineWarfare: Germany attacked everyshipping vessel made people angrybecause of the Sussex Pledge
Promise made by Germany to torpedoarmed merchant ships, but not passengerships without warning
Sinking of the Lusitania commercial ship, 114 Americancivilians died
2. Zimmermann Letter messagefrom Germany asking Mexico tobecome allies if the US entered the war
Continued attacks on passenger shipsand Zimmerman note led Wilson toask to go to war.
Stated, “We need to make theworld safe for democracy.”