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1) German U-boat attacks ships.
2) The Zimmerman Note
3) Bolshevik Revolution
4) Economic Ties

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German submarine warfare in 1915 had been new and improved. This results in the sinking of the Lusitania, where 1000 people die, 128 were Americans.

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The British had intercepted a note from Germany to Mexico, which had offered Germany to help Mexico obtain their territory that they had lost to the US, only if they attacked America.

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Russia pulls out of the war in 1917.

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The US traded more with Britain and France, so the US declared themselves are neutral, however they mostly sympathized with these two countries, which leads them to become not neutral.

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#1 Reason of why the US delayed joining the war 

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#1 Reason of why the US delayed joining the war 

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The US was a rising power at the time; an isolationist, so we did not want to interfere with foreign conflict.

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#2 Reason of why the US delayed joining the war

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#2 Reason of why the US delayed joining the war

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Immigration was also a key factor. There was about 28% German immigrants and 18% British immigrants, which was 2 of the largest groups out of Northeast European immigrants.