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Archduke Franz Ferdinand of Austria, heir to the Austro-Hungarian throne and his wife Sophie, Duchess of Hohenberg were assassinated in Sarajevo on 28 June 1914.
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On July 28, 1914, one month to the day after Archduke Franz Ferdinand of Austria and his wife were killed by a Serbian nationalist in Sarajevo, Austria-Hungary declares war on Serbia, effectively beginning the First World War.
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Great Britain declared war on Germany at 11:00 p.m. for violating Belgian neutrality. The United States declared neutrality at the outbreak of World War I.
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On May 7, 1915, the German U-20 (submarine) sank the British ocean liner Lusitania. Approximately 1,200 civilians died; more than 100 were U.S. citizens.
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November 7, 1915 (Sunday) Battle of Krylova — The French failed to capture an important Bulgarian stronghold located at a monastery in the Vardar Macedonia region.
