How did submarine warfare cause the U.S. to enter World War 1?
A German U-boat had sunk the British passenger ship the Lusitania at great loss of life. Unrestricted submarine warfare was suspended following public outcry in the US, but was reinstated in 1917. This eventually led to the American declaration of war on Germany.
Submarine warfare was abhorrent in the US during WW1. The British sank US ships trying to enter blockaded German ports. The same is true of US ships trying to enter blockaded British ports. However the Germans use submarine warfare to sink a USS Lusitania. That was the tipping for the US. Prior to then we were not wanting to get into "entangling alliances.
1. Circumstances that caused Wilson to change his mind and enter WW1: · Zimmerman Telegram - Germany sent to Mexico. Britain intercepted it and gave it to US Pres. Wilson. Germany planned to start unrestricted Submarine warfare on US and invited Mexico to join. (Germany was planning on breaking the Sussex pledge). · British influence in the US - Americans wanted to enter on the side of the Allies because the Germans and countries on…