Each of these movements were part of a process that some scholars
call "modernization." That process challenged, transformed and
sometimes overturned long-established
institutions and traditions. We have already seen the roots of that process at work in
the preceding centuries. By the last quarter of the eighteenth these
forces had so undermined the Ancien Regime that an Age of Revolution
came to mark the turn of a new century.
For our purposes we can see the nineteenth century running from
the end of the Age of Revolution in 1815 to 1914 when the First World
War began. It that century the revolutions of modernization created the
world inherited by the twentieth century.