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The assassination of Archduke Ferdinand of Austria was a major reason leading up to World War I.
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Austria-Hungary declared war on Serbia, which started affairs in Europe, turning this conflict into the Great War.
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The Germans started using gas to eliminate the opposition and to gain land. The other nation's armies started using the gas in the war.
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The Lusitania was sunk by the Germans in May 7, 1915. This act of violence created different propagandas and got the United States fired up.
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President Woodrow Wilson ran and won the November 1916 presidential election and pledged American neutrality in the Great War.
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A note from Germany's foreign minister, Arthur Zimmermann, was intercepted from Britain for Mexico to take back the Southwest states of America to distract Congress form the Great War.
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The U.S. declare war on Germany and Austria-Hungary after many submarine attacks on their own ships and other Allies' ships.
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A group called the Bolsheviks overthrow the Russian government and says Russia will continue to fight in World War I
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Germany signs an armistice with the Allies, the Ottoman Empire and Austira-Hungary collapses, Germany removes troops from France, and the Allies win the war.
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The Treaty of Versailles was a treaty that officially ended World War I between Germany and the Allied Powers.
