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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. They were shot to death by Gavrilo Princip, a Bosnian student and member of the Serbian secret society "Black Hand".
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On July 28, 1914, after a report of an unverified incident involving Hapsburg and Serbian troops, the government of Austria-Hungary declared war on Serbia. ... World War I was fought on three continents and across the world's major oceans.
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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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the German submarine U-20 torpedoed and sank the British cruise liner Lusitania traveling from New York to Liverpool, England. In a scant 18 minutes, the luxury liner with nearly 2,000 passengers sunk to the bottom of the Atlantic Ocean off the coast of Ireland.
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French passenger ship France IV was sunk in the Mediterranean Sea 85 nautical miles (157 km) southwest of Sardinia, Italy by German submarine SM U-38, with her crew surviving.
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The British intercept a telegram sent by Alfred Zimmermann in the German Foreign Office to the German embassies in Washington, D.C., and Mexico City. r.
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the United States formally declared war against Germany and entered the conflict in Europe. Fighting since the summer of 1914, Britain, France, and Russia welcomed news that American troops and supplies would be directed toward the Allied war effort.
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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.
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bringing the war now known as World War I to a close. Between the world wars, November 11 was commemorated as Armistice Day in the United States, Great Britain, and France.
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officially ending its involvement in World War I. The treaty subjected Germany to a number of harsh penalties and restrictions that many historians believe contributed to the rise of Adolf Hitler. Germany and the Allied Powers had signed an armistice on Nov.
