On this day in 1917, in a pivotal move toward U.S. entry into World War I, President Woodrow Wilson is apprised of the so-called Zimmermann Telegram, a message from German Foreign Secretary Arthur Zimmermann to the German ambassador to Mexico proposing a Mexican-German alliance in case of a war between the U.S. and Germany. British authorities handed Walter Hines Page, the U.S. ambassador to Britain, a copy of the Zimmermann Telegram, a coded message from Zimmermann to Count Johann von Bernstorff, the German ambassador to Mexico. In the telegram, intercepted and deciphered by British intelligence in late January, Zimmermann instructed his ambassador, in the event of a German war with the United States, to offer significant financial aid to Mexico if it agreed to enter the conflict on the Germans' side. Germany also pledged to restore to Mexico the lost territories of Arizona, Texas, and New Mexico. The State Department quickly sent a copy of the Zimmermann Telegram to Preside...