Explain how the Lusitania, German U-Boats, and the Zimmerman telegram led the U. S. to join WWI.

During the first years of war United States kept their policy of non-interference. Still, even during the 1915 they were helping Entente by sending them provisions and resources mostly through boats. German submarines were bombing some of the ships that were crossing the Atlantic Ocean, including Lusitania. all together there were 128 American civilians on board that were killed during the attack. Zimmerman telegram was a document according to which Germans wanted to involve Mexico against United States in the war. Telegram was intercepted and American public was furious.

Explanation:

United States entered the war in 1917 but were provoked by certain animosities mostly by the Germans. Most Americans supported the cause of Entente powers and this German provocations were the last drop to overfill the glass.

your answer will most likely be a.