Question

Which was a final action leading to U.S. participation in World War I?

a. The addition of Mexico to the Allies
b. Requests for support from England and France
c. The bombing of Hawaii
d. Unrestricted German attacks on submarines

Answer 1

The unrestricted German submarine warfare and the Zimmermann Telegram were the final actions leading to U.S. participation in World War I, triggering public outrage and leading to a declaration of war by Congress on April 6, 1917.

Step-by-step explanation:

The final action leading to U.S. participation in World War I was unrestricted German submarine warfare, most notably characterized by the sinking of ships carrying American civilians and the infamous Zimmermann Telegram.

renewed policy of submarine warfare declared that all ships, including those of neutral countries like the U.S., would be sunk without warning.

This caused significant American casualties and provoked public outrage. Meanwhile, the Zimmermann Telegram was a secret communication from the German foreign minister to Mexico proposing a military alliance between the two nations in the event of U.S. entry into the war.

The British intercepted and decrypted the telegram, and its exposure to the American public galvanized support for entering the war. Finally, on April 6, 1917, Congress declared war on Germany.