The Zimmerman Telegram qualifies as such.
It proposed a military and economic alliance to recover part of the lost territories during the Mexican-American War. The telegram however, was intercepted by the British Intelligence and forwarded to the U.S. Government, becoming enough casus belli for the US to enter WWI.
Mexico
Zimmerman Telegram
Italy refused to honor its alliance with Germany and Austria-Hungary in the triple alliance and joined the allied forces, being promised part of the territory in Austria after the war.
Germany was interested in becomes allied with Mexico. Germany promised Mexico territory it lost during the Mexican-American war (Texas, Utah, parts of California) should they form an alliance.
the note proposed an alliance between Germany and Mexico to attack the united states.
In the 1879, the Dual alliance (Germany and Austria) was made and then Italy joined in 1882 which made the Triple alliance.
The Zimmerman note, a not-so-secret telegram from the German foreign affairs minister to the President of Mexico intercepted by Americans. It proposed that, if Mexico teamed up with Germany against the US in WWI, Mexico could regain Texas, New Mexico, and Arizona. This turned US public opinion, which was previously pretty neutral, against Germany.
The Zimmermann Telegram or Note
Germany created the Triple Alliance to prevent a two front war.
The Triple Alliance involved Germany, Austria-Hungary, and Italy.
Germany, Austria-Hungary and Italy formed an alliance in 1888.
The Zimmerman Message was a coded message that was intercepted and decoded by British Intellegence. On January 16, 1917 Author Zimmerman sent a message to the German Ambassador in Washington. The message proposed that Germany and Mexico form an alliance if US entered the first world war. It stated that Germany was going to begin unrestircted submarine warfare on February 1, 1917. They wanted to keep US neutral but if it didn't succeed, they wanted an alliance with Mexico so that if US entered the war against Germany they would have the Mexicans to their south to face as well. The incentive for Mexico was that they would reclaim territory in New Mexico, Texas, and Arizona. Mexico declined the offer. On April 2, 1917 Woodrow Wilson asked Congress for a decloration of war and declared War on Germany