Why did the zimmermann telegram between germany and mexico concern the united states? germany promised to supply mexico with u-boats to attack american commercial ships. germany promised to set up a king in mexico undermining democracy in the americas. germany promised to mexico reconquer texas, new mexico, and arizona. germany promised to invade the united states across the texas-mexico border.

  Germany promised to help Mexico reconquer Texas, New Mexico, and Arizona.

Explanation:   The Zimmermann Telegram, or even known as the Zimmermann Note, was a coded telegram that the British intelligence officers  intercepted and deciphered. It was a secret diplomatic communication between the German Foreign Minister and the German Ambassador to Mexico in 1917 during the WWI. The goal was for Mexico to agree to be the Allies of Germany if the United States entered the war. In return, Mexico would recover Texas, New Mexico, and Arizona.

Germany promised to help Mexico reconquer Texas, New Mexico, and Arizona.

Explanation:

The Zimmermann telegram was a telegram sent by Arthur Zimmermann, Minister of Foreign Affairs of the German Empire, on January 16, 1917 (during the First World War), to his ambassador to Mexico, Count Heinrich von Eckardt. In it the ambassador was instructed to bring to the Mexican government a proposal to form an alliance against the United States. It was intercepted by the British espionage services, and its content accelerated the entry of the United States into the war.

they sent much needed naval support to the colonists, and were instrumental in the siege of yorktown