There were many more than three but the three main ones are the assassination of Archduke Franz Ferdinand, the rise of Nationalism, and the building up of military and alliances.
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Knight service, in the European feudal system, military duties performed in return for tenures of land. The military service might be required for wars or expeditions or merely for riding and escorting services or guarding the castle.
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The Ohio Gang was a gang of politicians and industry leaders closely surrounding Warren G. Harding, the 29th President of the United States of America.
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Answer the restrictions of society
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