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  Woodrow Wilson was the U.S. president during WWI
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  The name for the German submarines
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  The archduke Franz Ferdinand was assassinated by Gavrilo Princip, a member of the Black Hand.
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  The alliance between Germany, Italy, and Austria-Hungary.
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  The Alliance between Great Britain, Russia (left in 1917) , France, and America (joined in 1917)
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  He was part of a Serbian terrorist group by the name of the Black Hand he assassinated the Archduke Franz Ferdinand.
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  Austria-Hungary blamed Serbia for the assassination and declared war against them.
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  Woodrow Wilson declared that the U.S. would not pick sides in the war
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  Russia declares war on Austria-Hungary due to alliances.
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  Germany sank a British passenger ship and killed 1,200 people and out of those, 128 were Americans.
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  He was reelected in 1916 and his slogan was "He kept us out of War"
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  Many Americans wanted to stay out of the war.
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  The Germans asked the Mexico to help attack America when they attack but America intercepted this and we declared war on them
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  America joins the Allied Powers and enters WWI
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  The Russians left the Allied Powers due to problems in its own country