Answer:
The Zimmerman Telegram.
Explanation:
The Germans would provide military and financial support for a Mexican attack on the United States, and in exchange Mexico would be free to annex “lost territory in Texas, New Mexico and Arizona.” Coupled with the submarine attacks, it finally turned the U.S. government in favor of entering the fray.
The Duma is an elected legislature in Russia and some other republics of the former Soviet Union.
I know this does not help but put ur mind into it and trust me u will succeed.