What was the Zimmermann Telegram, and what effect did it have on American policy?

• A. A German proposal to Mexico to join the war against the U.S.; its interception helped sway U.S. toward war.
• B. A British warning about German plans to invade France.
• C. An American diplomatic note promoting peace.
• D. A Russian offer of alliance against Germany.

Answer: (A)

The Zimmermann Telegram was a secret German proposal to Mexico during World War I, offering a military alliance against the United States if the U.S. entered the war. Germany promised to help Mexico regain territory it had lost to the U.S. (such as parts of Texas, New Mexico, and Arizona) and to support Mexican efforts if war broke out between Germany and the United States. British intelligence intercepted and decoded the telegram and then shared its contents with the United States, making the message public in early 1917. The exposure stirred American anger and helped shift policy toward intervention, contributing to President Wilson’s decision to seek a declaration of war on Germany and the U.S. entry into World War I.

This wasn’t about a British warning about plans to invade France, nor was it an American note promoting peace, nor a Russian offer of alliance. The telegram highlighted a direct German threat to the Western Hemisphere and helped push the United States from neutrality toward active involvement in the war.