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The sunken ship, Lusitania increased the tensions of U.S going to war but was declined by president Wilson
A naval Warfare from Germany submarines that sinks American vessel without warnings.
A promise that both United States and Germany agree on, which was to send warning before shooting especially the passenger ships
The Zimmerman Notes was the last and most important factor which caused the US to lose all patience and declare war on Germany because they intercept a message from Germany to Mexico stating to Declare war on the US and in return they will be granted land.
The U.S finally Declare war on Germany thus entering WW1
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