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In February of 1915 Germany had declared war zone around Britain. And within each merchant the ships started to sink without any warning. This act from Germany angered neutral country , including the United States.

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On may 7, 1915, the German submarine torpedoed and sank the Lusitania. The Lusitania was a swift moving British cruise, it was traveling from New York to Liverpool, England. The sinking of lusitania cause international outrage and helped turn the public opinion against Germany. Of the 1,200 people killed, 128 were Americans.

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This pledge was a statement made by the Germans on May 4, 1916, stating that they would not sink passenger ships without warning. This pledge is what kept the US neutral, prior to them entering the war.

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The National Defense Act (June 3, 1916) was a U.S. federal law, updated the Militia Act of 1903. This included expanding the military, creating training corps, and the President was given the ability to federalize the National Guard.  Preparing the U.S. for war.

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The Zimmerman Telegram was a coded telegram sent on January 16, 1917. Within the note were plans to renew unrestricted submarine warfare, and forming alliances.
Impacting the United States, as threats to take over our land were included in the messages.

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On April of 1917 , Senate voted in support of the measure to declare on Germany
The house concurred 2 days later
The US declared war on Germany ally Austria-Hungary on December 7 of the same year (1917)

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The Russian Revolution took place in 1917, it was the final phase of WW1.
It removed Russia from the war , and Brough about the transformation of the Russian empire ,not the union of soviet socialist republics, it replaced Russia traditional monarch with the world'd first communist state. The Russian revolution was caused by the consequences of WW1 ( economic crises and lack of soldiers that were known of conditions of peasants).