January 28 – The United States ends its search for Pancho Villa.
February 5 – The new and current constitution is adopted.
February 24 – WWI: United States ambassador to the United Kingdom, Walter H. Page, is shown the intercepted Zimmermann Telegram, in which Germany offers to give the American Southwest back to Mexico if Mexico declares war on the United States.
March 11 – Venustiano Carranza is elected president of Mexico; the United States gives de jure recognition of his government.
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