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Archduke Franz Ferdinand and his wife were assassinated while visiting Sarajevo, Bosnia. He was next in line for the Austro-Hungarian throne. The killings set off decades old tensions in Europe and started WWI.
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Austria-Hungry declared war on Serbia because the Austria-Hungry ruler was killed in Serbia in 1914.
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Germans used poison gas for the first time in warfare. It was a new type of fighting and people didn't know how to defend against it.
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The sinking of the Lusitania pushed us closer to entering the war. Because it sank with American civilians on by a U-Boat.
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The Zimmermann Note was one of the other reasons the U.S entered the war in 1917. It was a message intercepted by the British and it was a alliance that Germany wanted to do with Mexico to Beat the U.S.
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Bolsheviks led by Lenin overthrew the Russian government because it was unstable. This led to the Russian leaving World War I.
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The U.S entered the war because the germans changed it policy of giving a warning before shooting a torpedo, but they changed to shoot on sight. That is one of the reasons why we joined the fight.
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WWI ended in 1918 because the United States pushed the Germans back to Germany and the Germans had nothing left no food water and there people were starving as we.
