which of these caused the united states to become involved in world war 1 ?
A.) the German invasion of Poland
B.) repeated violation of treaties by Japan
C.) enemy bombing of American military bases
D.) threats of American security made by Germany
Reason being that the sinking of ships by German U-boats, and a German attempt in the Zimmermann Note to get Mexico to declare war on the U.S. pushed the U.S. to getting involved.
