it was asking Mexico to attack U.S and Germany promised to help regain some of Mexico's lost territory (Texas, New Mexico, etc)
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Germany feared that America would soon enter the war (World War I) and it knew that Mexico was still upset about its loses during the Mexican War.
So German promised Mexico if it attacked America , if it entered the war, then Germany would help Mexico Financially and reward it by giving back all re-conquered land in New Mexico, Texas, and Arizona.
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The Zimmerman note.
to help Mexico regain U.S. territory
United States, Mexico, Germany The Zimmerman Telegram (1917) was sent by the foreign minister of Germany to the German consul in Mexico, suggesting that Germany would support Mexico in a war with the US.
Zimmerman *face palm*
The US, Germany, and Mexico were the three countries involved in the Zimmermann Telegram. It was sent by Germany to Mexico in 1917.