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Franz Ferdinand and his wife assassinated by Gavrilo Princip of Serbia.
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Austria chooses war against Serbia after death of their Archduke.
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Germany invades the Soviet Union, "to ensure the generations to come."
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Germany invades neutral Belgium.
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First British troops set foot on France.
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Serbia is also invaded by Austria-Hungary.
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First major battle of WWI
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German naval squadron commanded by Vice-Admiral Maximilian von Spee sinks two British armored cruisers with all aboard off the southern coast of Chile.
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Submarines destroy every enemy vessel they find.
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Ottoman government's systematic extermination of 1.5 million Armenians
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Secret pact between the Triple Entente and Italy
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British ocean liner Lusitania is torpedoed without warning by a German submarine off the south coast of Ireland.
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Battle fought by the armies of the British Empire and France against the German Empire. One of the bloodiest battles in history. Big loss for Britain.
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HMHS Britannic sinks in the Aegean Sea after a mine explodes, killing 30 people
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Occurs near the Egyptian border near Palestine.
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Generates support for the US declaration of war on Germany in April.
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US enters the conflict in Europe
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The first 14,000 U.S. infantry troops land in France at the port of Saint Nazaire.
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October Revolution
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U.S. President Woodrow Wilson outlined the United States' war aims in a speech given to Congress