Why did the united states enter the war ww1

1 sentence

It is called ULAZY.

Uristricted submarine warfare

Lusitania sunk and killed American passengers.

Angry Americans

Zimmerman telegram was a secret message trying to get Mexico involved and to get attack the U. S.

Yelled I declare War.

un-restricted war fare in the water because the Germans were sinking passenger ships such as the Lusitania