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The assassination of Archduke Franz Ferdinand instigated the beginning of World War I. He was assassinated by Gavrilo Princep
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Austria-Hungary declared war on Serbia because they claimed that Serbia was behind the assassination of the Archduke.
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The Germans used poison gas bombs to shoot behind enemy lines. The most common gases used were mustard gas, tear gas, or phosgene.
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The Lusitania was sunk on May 7, 1915 by a German U-Boat off the coast of Ireland. The Lusitania was cruise liner that was carrying a couple and their child to New York.
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Wilson was reelected in 1916 and entered the United States into the war and ended American Neutrality.
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A telegram sent to Mexico by German foreign minister, Arthur Zimmerman. This offered an alliance with Mexico in the event that the United States joined the war. This message was intercepted by Britain and presented to President Wilson.
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The United States officially enter the war and join the Allies on April 6, 1917. There were many causes that made the Americans join the war such as the Zimmerman Note and the sinking of ships by the Germans.
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The overthrowing of the Russian government held by the czar changed the Russian government from an autocracy to a more democratic government.
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Because of the Treaty of Versailles, Germany agrees to act in good faith and leave the Allies alone. This therefore ends the war.
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Was signed by the Allies and Germany on June 28, 1919 which said that Germany had to take full responsibility for any conflict that had happened, give the Allies billions of dollars, disarm all soldiers, and turn over big portions of land to the Allies.
