The Zimmermann Telegram

By the winter of 1916-1917, World War I had ground to a brutal stalemate. On the Western Front, millions of soldiers faced each other from muddy trenches, their lives measured in yards gained or lost. Germany, pressed by a relentless British naval blockade, found its economy faltering and its people suffering from shortages of food and basic goods. Desperate to break the deadlock, German leaders chose a risky strategy: restart unrestricted submarine warfare, meaning any vessel—even those from neutral nations—heading for Allied ports was now a target. They understood this move might pull the United States, officially neutral but angered by earlier attacks like the Lusitania sinking, into the conflict. To offset this risk and keep America distracted, German planners eyed the southern border. If the U.S. became preoccupied with conflict closer to home, perhaps on Mexican soil, it might think twice before joining the war across the Atlantic.