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Zimmerman Telegram, sinking of the Lucitania, and German aggression. There were two primary reasons that the United States entered into World War I: The Sinking of the Lusitania, and the intercepted Zimmerman telegram. Let's start at the sinking of the Lusitania. It was carrying 128 Americans onboard, despite German threats of sinking any ship that came into their waters. In fact, they actually took out a full page ad in an American news paper and warned the United States to not board the Lusitania. In 1917, Germany warned the entire world of submarine warfare. Next, the Zimmerman telegram was intercepted by the United States. It detailed a plan to keep America neutral, but offered an alternative should this not prove to be the case--making a deal with Mexico to help them regain lost territory to the United States. This scared Americans to death and with their fear came their demands for war.

Thus, America enters the war (near the very end, mind you), and tips the scale of the stalemate. If I had to choose which one was more prominent, I'd have to say the Zimmerman telegram. Hope this helps, Alex

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Q: The principale reason for US entry into world war 1?
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Related questions

What was the immediate reason for the entry of the US into World War 2?

The Japanese attacked Pearl Harbor December 7, 1941.


What were the effects of Pearl Harbor on other nations?

Because this was the main reason for the US entry in WW2, and the American entry in the war was significant for the course and outcome, it affected the entire world.


Which of these was not directly related to the entry of the US into world was 1?

The Franco-Prussian War was not directly related to the entry of the US into World War I.


What were the reason for the us entry into world war 2?

Maybe you haven't heard of the Japanese attack on Pearl Harbour on 7 December 1941.


What was the biggest problem America faced after entry into World War 1?

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One of the primary causes for US entry into world war 1 was the use of?

do you mean what caused us entry into world war one? if so then the sinking of the USS Lusitania by German u-boats was what caused American entry into the war


What turned World War I around?

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Who announced US entry in World War 1?

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What was The stalemate during World War 1 was broken in 1917 by?

the entry of the U.S. into the war.


What prompted entry in to World War 2 by us?

The U.S. entered World War II after the bombing of Pearl Harbor. Before that point in the war, the U.S. was practicing an isolationist philosophy, and just supporting the Allies through other means. However, once the U.S. was attacked, they entered the war and was a main reason why the war was won.


What was the basic cause of the US entry into World War 1?

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Which American attitude at the beginning of world war 2 delayed the country's entry into the war?

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