3rd » World War I: The United States breaks off diplomatic relations with Germany a day after the latter announced a new policy of unrestricted submarine warfare.
5th » The 1917 Constitution of Mexico known as current constitution of Mexico is adopted, establishing a federal republic with powers separated into independent executive, legislative, and judicial branches.
23rd » First demonstrations in Saint Petersburg, Russia. The beginning of the February Revolution.
24th » World War I: The U.S. ambassador to the United Kingdom is given the Zimmermann Telegram, in which Germany pledges to ensure the return of New Mexico, Texas, and Arizona to Mexico if Mexico declares war on the United States.
26th » The Original Dixieland Jass Band records the first jazz record, for the Victor Talking Machine Company in New York.