Question

What did President Woodrow Wilson declare as a reason to abandon neutrality and enter the European conflict in 1917?

Answer 1

The Zimmermann Telegram ›

On April 2, President Wilson asked Congress to declare war against Germany specifically citing Germany's renewed submarine policy as “a war against mankind. It is a war against all nations.” He also spoke about German spying inside the U.S. and the treachery of the Zimmermann Telegram.