How did the zimmermann note help push the US into entering world war 1?

The Zimmermann Note, a secret telegram sent by Germany to Mexico in January 1917, proposed a military alliance between Germany and Mexico if the U.S. entered World War I against Germany. It promised Mexico the territories of Texas, New Mexico, and Arizona in return for their support. The British intercepted and decoded the message, then shared it with the U.S., leading to outrage among Americans. This revelation, along with Germany's unrestricted submarine warfare, shifted public opinion and political sentiment, ultimately pushing the U.S. to join the war against Germany in April 1917.