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The Archduke and his wife were both killed by Gavrilo Princip, a member of Bosnian -Serb nationalist group seeking to unite territories containing ethnic Serbs under Serbia's law. -
Austria-Hungary declared war on Serbia for killing their Archduke -
The Austro-Hungarian Empire declares war on Russia -
Allied Forces halt German advance into France during the first battle of Marne
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German submarine sinks the passenger liner Lusitania after crossing from New York, to Liverpool, England.
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Italy, how was once a central power, has now become a allied power, and has declared war on Austria-Hungary
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The battle of Somme begins
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Battle of Verdun ends with 550,000 French and 450,000 German casualties.
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The United States declares war on Germany
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President Woodrow Wilson presents to Congress his outline of Fourteen Points required for peace.
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Allied forces begin the attack at Meusse-Argonne, the final offensive of the war.
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Germany signs the Armistice at Compiègne, ending World War I.
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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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United States signs separate peace treaties with Germany, Austria, and Hungary.