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Archduke Franz Ferdinand was assassinated by a Bosnian Serb nationalist during an official visit to the Bosnian capital of Sarajevo.
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Austria-Hungary declares war on Serbia, beginning the First World War.
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Germany declares war on Russia
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Germany declares war on France, and invades neutral Belgium.
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The first British troops land in France.
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Great Britain and France declare war on Austria-Hungary
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Four division of the British Expeditionary (BEF), commanded by Sir John French, struggle with the German 1st Army over the 60-foot-wide Mons Canal in Belgium, near the French Frontier.
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The Royal Navy suffered its first defeat of World War One.
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Germany declares war zone around British Isles. Kaiser Wilhelm announced Germany's intention to sink all ships sailing under the flags of Britain, Russia or France found within British waters.
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American Holocaust began. The Turkish government arrested and executed several hundred Armenian Intellectuals.
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After receiving the promise of significant territorial gains, Italy signs the Treaty of London.
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The British ocean liner Lusitania is torpedoed without warning by a German Submarine off the south coast of Ireland.
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A battle of the First World War fought by armies of the British Empire and France against the German Empire.
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HMHS Britannic sinks in the Aegean Sea after a mine explodes, killing 30 people
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A minor British victory that ended the Sinai campaign of 1916.
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German foreign secretary Arthur Zimmerman publicly admits the "Zimmerman telegram" is genuine. Generates support for the US deceleration of war on Germany in April.
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United States formally declared war against Germany and entered the conflict in Europe.
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First American troops land in France
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China declares war on Germany and Austria.
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Gen Pershing and US troops see action on Western Front for the first time
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U.S president Woodrow Wilson outlined the US war aims in a speech given to Congress. Which was to become known as his "fourteen points"
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First recorded case of Spanish flu at Funston Army Camp.
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The armistice that ended fighting in World War I between Allies and their opponent, Germany.
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The Paris peace conference open to draw up the treaties formally ending the WWI
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The treaty ending the state of war between Germany and the Allied power was signed this day.
