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The Archduke Franz Ferdinand of Austria-Hungary was assassinated in Sarajevo, Serbia, during a diplomatic visit to the neighboring country.
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Germany invades Belgium and World War I begins.
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Germany fired large shells filled with gas. This was the first time that large amounts of gas was used in battle.
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Brittain deploy the first tanks ever used in battle, and even though they were effective for breaking through barbed wire, they didn't really work as a destructive weapon quite yet.
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Germany starts using submariens in European waterways without restriction. As this puts American ships in danger, this is the act that finally makes U.S. declare war on Germany.
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U.S. Congress approves the declaration of War on Germany, and joins in alliance with France and Brittain.
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Germany signs a peace treaty with Russia, and gains land that had belonged to Ukraine and Poland.
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The first major US offensive of World War I.
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The German Kaiser Wilhelm abdicates ending all hope for a German victory. He escapes to the Netherlands where he live the rest of his life in peace.
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The peace treaty that ended World War I.
