The zimmerman telegram was a huge diplomatic mistake by

The right answer is Germany.

Amid World War I, Germany endeavored to send the Zimmerman Telegram to Mexico. In this message, the Germans requested that Mexico attack the United States. The Germans asked of this since they knew whether the United States was battling with Mexico, they would not get engaged with World War I. This would build the odds of German achievement in this war.

The Zimmerman Telegram, nonetheless, was caught by partnered powers and given to the American government. In the wake of perusing this wire, the American government pronounced war on Germany, basically having the correct inverse result that the Germans were seeking after.