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First Russian Revolution

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The note proposed a military alliance between Germany and Mexico in case of a war between Germany and the U.S.

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A message from the German foreign secretary, Arthur Zimmerman, to Mexico

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Zimmerman Note

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Germany broke their promised to the U.S to stop attacking passenger ships

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submarines sink vessels without warning.

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Germany calls of unrestricted submarine (U-boat) warfare

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1,198 out of 1,959 passengers and crew drowned along with 128 Americans.

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A British liner called RMS Lusitania was torpedoed without warning by German submarine

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The Lusitania was sunk

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Millions were killed and countries were destroyed

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A major war between the Central Powers (Germany, Austria-Hungary, Bulgaria, and the Ottoman Empire) and the Allied Powers (Great Britain, France, Russia, Italy, Romania, Japan, and the U.S)

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World War 1 begins

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Their assassination sparked events that later led to the outbreak of World War 1

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Archduke Franz Ferdinand of Austria and his wife were assassinated by a Black Hand Gang member named Gavrilo Princip.

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Assassination in Sarajevo