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Archduke Francis Ferdinand heir to the Austria-Hungary throne and his wife are assassinated by a Serbian Nationalist in Sarejevo.
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Battle of the Falkland Islands between British and German Naval units.Germany lost four warships and more than 2,000 sailors in the Falkland Islands, compared with only 10 British deaths.
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Germany declares a submarine blockade of Great Britain. Any ship approaching England is considered a target.
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President Wilson launches a nationwide whistle-stop campaign to generate support for Preparedness and the Continental Army with three speeches in New York.
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Romania enters the war on the Allies side.
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German forces begin withdrawal to strong positions on the Hindenburg Line.
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President Woodrow Wilson delivers war address to Congress and asks the House of Representatives to declare war on Germany.
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US forces clear the St.-Mihiel salient, during which the greatest air assault of the war is conducted by the U.S. Airforce..
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Wilson appeals directly to the Italians in an effort to gain their support for his views on the peace settlement.
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The Treaty of Versailles is signed in Hall of Mirrors at Versailles, officially ending the War.
