Monarchy abolishment has occurred throughout history, either through
revolutions,
coups d'état, wars, or legislative reforms (such as
abdications). The founding of the
Roman Republic is a noteworthy example. The twentieth century saw a major acceleration of this process, with many monarchies violently overthrown by revolution or war, or else abolished as part of the process of
decolonisation. By contrast, the restoration of monarchies is rare in modern times, with only two major examples,
Spain and
Cambodia.