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Archduke Franz Ferdinand was assassinated.
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Austria-Hungary declares war on Serbia.
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Germany declares war on Russia.
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Germany declares war on France and invades 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. Serbia is invaded by Austria-Hungary.
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Japan declares war on Germany.
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Ottoman Empire enters the war, Austria Hungary attempts to invade Serbia and the British suffered their most crippling defeat from the Germans.
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Germany declares war zone around British Isles.
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Armenian Genocide begins.
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Allies sign the Treaty of London
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The sinking of the Lustiania
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Somme Offensive begins
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Britannic sinks in Aegean Sea
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The Battle of Rafa occurs near the Egyptian border with Palestine
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German Foreign Secretary Arthur Zimmermann publicly admits the "Zimmermann Telegram" is genuine
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United States formally declared war against Germany and entered the conflict in Europe
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The first American troops land in France
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China declares war on Germany & Austria
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Gen Pershing & US troops see action on Western Front for 1st time
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The Fourteen Points which was a statement of principles for peace that was to be used for peace negotiations in order to end World War I
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First recorded case of Spanish flu at Funston Army Camp, Kanas; start of worldwide pandemic killing 50-100 million
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The end of World War One became official on the 11th hour of the 11th day of the 11th month
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The Spanish flu pandemic ravaged Tonga, killing eight percent of the population, including the country's sitting monarch Queen Takipō
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Leaders from the Allied nations began a series of discussions that became known as the Paris Peace Conference to settle issues raised by the war and its aftermath
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Germany signed the Treaty of Versailles, officially ending its involvement in World War I