History quiz

What factor changed Woodrow Wilson opinion about entering World War 1?

The Zimmermann telegram changed Woodrow Wilson's opinion about entering World War 1. The telegram was a secret message from the German foreign secretary, Arthur Zimmermann, to the German ambassador in Mexico, Heinrich von Eckardt. It proposed a military alliance between Germany and Mexico against the United States. The telegram was intercepted and decoded by British intelligence, and was given to the United States government. The publication of the telegram caused outrage in the United States, and helped to turn public opinion in favor of entering the war.