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Germany, Italy, and Austria-Hungary formed the Triple Alliance. They promised to protect each other from France and Russia.
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France, Great Britain, and Russia formed the Triple Entente. They promised to support each other from Germany.
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Austria-Hungary annexed Bosnia and Herzegovina. They were formerly controlled by the Ottoman Empire.
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Franz Ferdinand's assassination was the spark for World War I.
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This event actually started WWI. Austria-Hungary declared war on Serbia because Serbia killed Archduke Franz Ferdinand and his wife.
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Germany invaded Belgium, who was fortified around the border. Other nations were worried because Germany invaded a neutral country, which was against international laws.
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A German U-Boat fired a torpedo into the side of the ship, which then caused chaos. The ship sunk within 18 minutes.
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Germany promised to not torpedo any passenger ships that come by, but they broke their promise. They torpedoed the Sussex.
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The British attacked the Germans near the Somme River, and were badly woundly and also many killed.
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German foreign minister Zimmermann sent a message to the mexican government. The British intercepted the message and told America.
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Wilson declared war on Germany for a few reasons. One was because of the Zimmermann telegram in which Germany and mexico were going to team up.
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This act required men to register with the government if wanting to be randomly selected into the military.
