Answer: Most historians agree that American involvement in World War I was inevitable by early 1917, but the march to war was no doubt accelerated by a notorious letter penned by German foreign secretary Arthur Zimmermann. On January 16, 1917, British code breakers intercepted an encrypted message from Zimmermann intended for Heinrich von Eckardt, the German ambassador to Mexico. The missive gave the ambassador a now-famous set of instructions: if the neutral United States entered the war on the side of the Allies, Von Eckardt was to approach Mexico’s president with an offer to forge a secret wartime alliance. The Germans would provide military and financial support for a Mexican attack on the United States, and in exchange Mexico would be free to annex “lost territory in Texas, New Mexico and Arizona.” In addition, Von Eckardt was told to use the Mexicans as a go-between to entice the Japanese Empire to join the German cause.
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