The Secrets of the Zimmermann Telegram

During WWI, Germany sent a secret message proposing a military alliance with Mexico against the US, using an American cable system. The Allies, led by Great Britain, dominated telecommunications, cutting Germany's cables. Germany saw the US as a threat despite its isolationist stance. In 1917, Germany promised Mexico land if it declared war on the US. The Zimmerman Telegram was intercepted and decoded by the British, who kept it secret to avoid revealing their espionage. When the telegram's contents became public, US opinion shifted, leading President Wilson to declare war on Germany, marking a turning point in the Allied victory.

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