Apparently, industrial societies cannot exist within a monarchy form of government. To continue industrialization Europeans had to leave behind the old feudal system. In a few cases, graceful changes occurred with the formation of constitutional monarchies, but in most cases, change occurred turbulently.
In the Mill.
Pittsburgh, Pennsylvania, 1909.
Photo: Lewis Wickes Hine.
National Archives and Records Administration.
Still Picture Branch; College Park, Maryland.
The reason for the end of the feudal era, the widespread political unrest - and ultimately the World Wars - was industrialization. It is interesting that WW I started with Austria-Hungary, the last great dynastic empire. At the end of World War I, the Austria-Hungary Empire dissolved into nationalist states. Austria-Hungary's Habsburg monarchy also dissolved at this time.
Near the end of World War I, most of the world's remaining monarchies crumbled. This cleared the way for new industrial societies and the new industrial era. Industrialization was the underlying cause of these turbulent changes and the cause of industrialization was war.