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The event

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Archduke Franz Ferdinand, the King of Austria-Hungary was assassinated by Gavrillo Princip, A serbian man.

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Austria-Hungary declares war on Serbia because of the assassination of their king, which caused the beginning of World War I.

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Austria-Hungary invades Russia (soviet Union).

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Germany begins Naval blockade of great Britain.

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German submarine sinks the passenger ship, Lusitania during crossing from New York to Liverpool killing 128 Americans. This event led America to join World war I.

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Italy Declares war on Austria-Hungary.

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Germany begins the attack on Verdun.

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Allied offensive begins the Battle of the Somme.

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United States severs diplomatic relations with Germany.

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American combat forces arrive in France.

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Russia signs armistice with Germany.

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Russia signs the treaty of Brest-Litovsk with Germany.

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Germany begins its final offensive of the war.