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The heir to Austro-Hungarian throne was assassinated by Gavrilo Princip, who was in a group along with seven other assassins'.
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Battles like Air Raids, the First and second battle of the Ypres.
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The British Lusitania ship was torpedoed by German Navy boat, this happened after Germany declared they would start unrestricted submarine warfare. The result of The Lusitania sinking had 1,198 fatalities.
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The Battles of Verdun, Jutland, and Somme took place in February, May, and July.
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The Zimmerman Telegraph proposed an alliance between Germany and Mexico. The German encouraged Mexico to declare war on the US. German military told Mexico they could recover Texas, Arizona, and New Mexico.
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Germany continued unrestricted submarine warfare with their U-boats.
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U.S. declared war on Germany.
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America declared war on Austria-Hungary.
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German U-boats started arriving in U.S. waters.
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The treaty was signed in the Palace of Versailles, this ended the war between Germany and the allied powers.