The sinking of the Lusitania and Unrestricted Submarine Warfare
The Sussex Pledge
The Zimmermann Telegram and the US enter WW1.
the sinking of the Lusitania occurred in may 1915 in which Germany bombarded a US ship. Then Germany eventually declared Unrestricted Submarine Warfare because they couldn't distinguish certainly enough from merchant and armed vessels.
Sussex Pledge Pledge by the German gov that said submarines would warn ships before attacking
Germany sent a telegram to mexico telling them to start a war with the United States and as their reward they will be able to get land back from the United States including Texas and California. The united states joined the war in April 6. 1917 on the allied side.
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