Question

What upset the United States and moved it closer to entering the war?

Answer 1

If it was the First World War, it would be the sinking of the Lusitania and the Zimmerman telegram.  This caused Americans to abandon their isolationist policy and join the First World War.  If it was WWII, it could be bombing of Pearl Harbor.

Answer 2

Answer:

the correct answer is the zimmerman telegram

Explanation: