the zimmerman note.
For one, the message the US intercepted from Germans, meant for Mexico for Mexico to declare war against the US
Germany wasn't the most friendly to the US in war time. They sent a note to Mexico asking them to take back the Southern states(Zimmerman Telegram). The British intercepted this message and passed it on the the U.S. Germany and Britain caused the U.S. to fight in World War I
Zimmermann telegram
Zimmermann telegram
There were a number of "casus belli" (Latin for "Causes of War"), but the ultimate reasons were based on Germany's policy of unrestricted submarine warfare. The "Zimmerman telegram", a German diplomatic message addressed to Mexico, had proposed that Germany and Mexico should enter into an alliance in which previously Mexican territories such as Texas, New Mexico and Arizona would be restored to Mexico when Germany won the war. Mexico ignored the proposal, but the message was intercepted and decrypted by the British, who used it encourage the US to enter the war overtly on the side of Britain. This provided the final impetus for Congress to declare war.
There were a number of "casus belli" (Latin for "Causes of War"), but the ultimate reasons were based on Germany's policy of unrestricted submarine warfare. The "Zimmerman telegram", a German diplomatic message addressed to Mexico, had proposed that Germany and Mexico should enter into an alliance in which previously Mexican territories such as Texas, New Mexico and Arizona would be restored to Mexico when Germany won the war. Mexico ignored the proposal, but the message was intercepted and decrypted by the British, who used it encourage the US to enter the war overtly on the side of Britain. This provided the final impetus for Congress to declare war.
An oil platform owned by British Petroleum
There is no single pin point event that caused the US to enter into WWI, but the Zimmerman Note was one. There was a message sent from Germany to Mexico asking for them to team up to fight the US. Britain intercepted it and shared new to the US. It was uncertain if it was actually true or if Britain made it up to get the US into the war, but that was one event.
The Zimmerman Telegram, which was a telegram from Germany to Mexico to essentially launch a full-scale attack on the United States. It was intercepted by the U.S. and caused them to act quickly by entering the war. Additionally, the sinking of the Lusitania, and the deaths of several hundred Americans caused the U.S. to act.
Alliances was signed and if one alli declares war first than the other country goes into war.
Proclamation of 1763
Proclamation of 1763