Question

in the telegram, germany asked mexico to join forces if the united states entered the war.

Explanation:

The Zimmermann Telegram was a secret diplomatic communication sent by Germany to Mexico during World War I. In this telegram, Germany proposed a military alliance with Mexico against the United States. The telegram was intercepted and decoded by British intelligence, and its contents were later revealed to the United States. This revelation was one of the factors that contributed to the United States' decision to enter World War I.

Answer:

Zimmermann