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Archduke Franz Ferdinand of Austria and his wife Sophie are shot to death by a Bosnian Serb nationalist during an official visit to the Bosnian capital of Sarajevo. This sparked a chain of events that led to the outbreak of World War -
after Archduke Franz Ferdinand of Austria and his wife were killed by a Serbian nationalist in Sarajevo, Austria-Hungary declares war on Serbia -
Great Britain declared war on Germany for violating Belgian neutrality. The United States declared neutrality at the outbreak of World War I. -
The Gorlice–Tarnów offensive during World War I was initially conceived as a minor German offensive to relieve Russian pressure on the Austro-Hungarians to their south on the Eastern Front -
German cruiser "Undine" sunk by British submarine "E.-19"
Italian S.S. "Ancona " sunk by Austrian submarine. -
Germany begins an aerial bombing campaign against Britain using Zeppelins. -
the United States formally declared war against Germany and entered the conflict in Europe, the U.S. went into war to protect shipping and the freedom of trade while in international waters. Since the beginning of that year, 19 U.S. merchant vessels were sunk by German U-boats. -
Mexican revolutionary leader Álvaro Obregón began a blockade around Mazatlán that lasted two months. More than 50 people were killed and over 100 injured in a fire that swept the commercial section of Valparaíso, Chile. began in 1910, ended dictatorship in Mexico and established a constitutional republic -
Battle of Mount Ortigara – Shock troops with the Austro-Hungarian Army pushed 11 Italian divisions off the Mount Ortigara summit, regaining their important defensive position in Asiago, Italy. Italy suffered 23,000 casualties while Austria-Hungary sustained only 9,000 casualties. -
the Great War ends. At 5 a.m. that morning, Germany, bereft of manpower and supplies and faced with imminent invasion, signed an armistice agreement with the Allies in a railroad car outside Compiégne, France. -
Germany and the Allies signed the Treaty of Versailles, formally ending World War I and providing for the creation of the League of Nations.