As a result of disclosing German plans to the United States, the Zimmermann telegraph changed American perceptions of their engagement in the First World War.
In January 1917, German Minister in Mexico received a classified communication from German Foreign Secretary Arthur Zimmermann. The plan in the note was to restart limitless submarine warfare and forge alliances with Mexico and Japan in the event that the United States waged war on Germany.
The communication, which was intercepted by the British and sent to the United States, caused outrage when it was published, which prompted the United States to enter World War I.
The telegram was forwarded by Zimmermann's office to the German embassy in the US for retransmission to Eckhardt in Mexico. It has long been believed that the telegraph was sent over three different routes. It was enclosed in dispatches conveyed by ambassadors from two neutral countries through radio and telegraph cable (the United States and Sweden).
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