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Archduke Franz Ferdinand of Austria gets assassinated.
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After the assassination of Archduke Franz Ferdinand, Austria-Hungary delcares war on Serbia
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Germany declares war on Russia
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Germany invades Belgium
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France and Germany declare war on each other
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Germany declares war on many countries of Europe
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Great Britain declares war on Germany
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The Ottoman Empire declares a holy war on behalf of the Ottoman government
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Italy declares war on Austria-Hungary
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Bulgaria enters WW1
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Portugal declares war on Germany
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Romania declares war on Austria-Hungary, formally entering WW1.
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Greece declares war on Central Powers
