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Archduke Francis Ferdinand is assassinated.
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Austria-Hungary declares war on Serbia, beginning World War I.
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Germany invades Luxembourg and Belgium. France invades Alsace. British forces arrive in France. Nations allied against Germany were eventually to include Great Britain, Russia, Italy, Australia, New Zealand, South Africa, Rhodesia, Romania, Greece, France, Belgium, United States, Canada, Serbia, India, Portugal, Montenegro, and Poland.
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Austria-Hungary invades Russia.
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German submarine sinks the passenger liner Lusitania during crossing from New York to Liverpool, England, killing 128 Americans.
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President Woodrow Wilson threatens to sever diplomatic ties between the United States and Germany following the sinking of the passenger ferry Sussex by a U-Boat in the English Channel. The attack marked the beginning of a new U-Boat campaign around the British Isles. But in response to Wilson, the Germans call off the U-Boats.
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US severs diplomatic ties with Germany
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The United States declares war on Germany.
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American combat forces arrive in France.
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Anglo-French Conference assembles in London to discuss the deposition of King Constantine of Greece and the occupation of Athens and Thessaly (continued on 29th) (see June 11th).
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President Woodrow Wilson presents to Congress his outline of Fourteen Points required for peace.
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Russia signs the Treaty of Brest-Litovsk with Germany.
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United States forces are victorious in the Battle of Cantigny, the first independent American operation.
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Germany signs the Armistice at Compiègne, ending World War I.
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Draft of the covenant of the League of Nations is completed.
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Allied and German representatives sign treaty of Versailles. The United States signs treaty of guaranty, pledging to defend France in case of an unprovoked attack by Germany.
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Treaty of Versailles takes effect.
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The United States Senate rejected for the second time the Treaty of Versailles, by a vote of 49-35, falling seven votes short of a two-thirds majority needed for approval.
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British airship R-38 crashes in River Humber, 44 die
