Which final action led to U.S. participation in World War I?

Question

Responses

the addition of Mexico to the Allies
the addition of Mexico to the Allies

the bombing of Hawaii
the bombing of Hawaii

requests for support from England and France
requests for support from England and France

unrestricted

Answer 1

The final action that led to U.S. participation in World War I was unrestricted submarine warfare by Germany, which included the sinking of the Lusitania and other ships with American passengers. This action, along with the interception of the Zimmermann Telegram (in which Germany proposed a military alliance with Mexico against the United States), ultimately pushed the U.S. to declare war on Germany on April 6, 1917.