The Zimmermann Telegram was sent in 1917 from Germany to Mexico, asking them to join Germany and Austria-Hungry in World War I. The telegram was never delivered, but it was a big factor in the US deciding to get involved in World War I.
You can read the contents here: http://en.wikisource.org/wiki/Zimmermann_Telegram
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Zimmerman *face palm*
Germany.
The Zimmerman telegram, because it was an act of war
They were trying to turn Mexico against America.
yes: The Zimmerman telegram's message was basically "If Mexico joined a military alliance against the United States, Germany would help Mexico recover the territories it had lost in 1848 including several western states." Even though Mexico refused, it strengthened Wilson's resolve against Germany and was one of the major factors pulling America into WWI (or, as it was known then, the Great War).