The Zimmerman note.
Mexico
It affected public opinion, and helped convince US leaders to send American troops to fight in Europe.
The Zimmerman Note was a telegram sent on 16 January 1917 by the Foreign Secretary of the German Empire to the German Ambassador in Washington, DC, with instructions that it be forwarded to the German Ambassador in Mexico. The coded text was intercepted and decoded by the British who provided it to the US government. The contents of the note, published in US newspapers on 1 March 1917, caused public outrage. The Note proposed that, in the event of the US entering the European War opposed to Germany, the German Ambassador should seek Mexican help in brokering an alliance between Germany and Japan. The German Ambassador to Mexico should then also propose a military alliance between Germany and Mexico in which Mexico would receive aid in reclaiming Texas, New Mexico and Arizona from the US.
to help Mexico regain U.S. territory
The Zimmerman note was meant to be sent to Mexico, before it was intercepted by the United States.
The Zimmerman note was written to gain alliance with Mexico. It was intercepted and is one of the reasons the US decided to fight in World War 1.
the zimmerman note.
The British intercepted the Zimmerman Telegram while monitoring German diplomatic messages, and revealed it to the US.
It was received by the Mexican president, Venustiano Carranza, on January 16, 1917. He officially declined the offer stated on the telegram on April 14 of that same year, but by that date, the United States had already entered WW1.
The Zimmerman Telegram qualifies as such.
Germany
The Zimmerman Telegram. The authenticity of it is questioned by many historians.
The Zimmerman note contained a suggestion of an alliance between Mexico and Germany. This note was intercepted and when it was read, it angered the American people.
German foreign secretary Arthur Zimmerman had secretly proposed a German-Mexican alliance against the United States. When the note was intercepted and published in March 1917, it caused an uproar that made some Americans more willing to enter the war.
The note was from a German Ambassador (Zimmerman) to Mexico which stated that if Mexico attacked the then neutral USA then they would receive a very nice monetary award. The note was intercepted by the Brits and then given to the US.
The Zimmerman note.