section_path: History/19th century
section_name: 19th century
paragraph_text: 19th century
  
  The political development of nationalism and the push for popular sovereignty culminated with the ethnic/national revolutions of Europe. During the 19th century nationalism became one of the most significant political and social forces in history; it is typically listed among the top causes of World War I.
  
  Napoleon's conquests of the German and Italian states around 1800–1806 played a major role in stimulating nationalism and the demands for national unity.
  
  English historian J. P. T. Bury argues:
  
  Between 1830 and 1870 nationalism had thus made great strides. It inspired great literature, quickened scholarship, and nurtured heroes. It had shown its power both to unify and to divide. It had led to great achievements of political construction and consolidation in Germany and Italy; but it was more clear than ever a threat to the Ottoman and Habsburg empires, which were essentially multi-national. European culture had been enriched by the new vernacular contributions of little-known or forgotten peoples, but at the same time such unity as it had was imperiled by fragmentation. Moreover, the antagonisms fostered by nationalism had made not only for wars, insurrections, and local hatreds—they had accentuated or created new spiritual divisions in a nominally Christian Europe.