Why did the zimmermann telegram between germany and mexico concern the united states?

Germany promised to help Mexico reconquer Texas, New Mexico, and Arizona, is the right answer.

Explanation:

When Wilson considered his decisions concerning the submarine problem, he also had to approach the issue of Germany’s trials to join a secret connection with Mexico. On 19th January 1917, British marine intelligence caught and decrypted a message sent by Arthur Zimmermann, Foreign Minister of Germany, to the Ambassador of Germany in the Mexico City. This telegram was promised the government of Mexico that Germany would provide assistance to Mexico regain the region it had ceded to the U.S. after the Mexican-American War. However, in return to this, Germany demanded Mexican give assistance in the war.

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