World War I, military conflict.

World War I, military conflict, from August 1914 to November 1918, that involved many of the countries of Europe as well the United States and other nations throughout the world. World War I was one of the most violent and destructive wars in European history. Of the 65 million men who were mobilized, more than 10 million were killed and more than 20 million wounded. The term World War I did not come into general use until a second worldwide …

…wanted autonomy within the empire. They were inspired by the principles of nationalism that had brought about the political unification of Italy in 1861 and Germany in 1871. It was also openly known in Europe that if war should come, Germany could not depend on Italy, the third member of the Triple Alliance. Italy was bound only to fight a defensive war, and in any event it was more of a rival than an ally of Austria-Hungary.