Question

What were the Germans proposing to the Mexicans in this telegram?

Answer 1

I assume that you are referring to the Zimmerman Note from the Foreign Minister of Germany. Germany offered support in attacking the U.S. to reclaim their land.
But the message was intercepted, but the chance of Mexico attacking was very slim because they were not and still not a military power.

Answer 2

Answer: Mexico would recover Texas, Arizona and New Mexico

Explanation: The German proposal to the Mexicans, known as the Zimmerman Telegram, was a proposal that the Germans directed Mexicans to take their side if the United States entered the First World War. This telegram intercepted by the British Intelligence Service sent in January 1917, by the German Secretary of Foreign Affairs, Arthur Zimmerman, who publicly announced in March the same year that the telegram was really sent as a precautionary measure in the event that the US announced the war against Germany.