monarchy (note monarchy does not mean absolutism kings typically had to rule according to limits set by custom) is the most natural form of government for any society at scale. monarchs have better incentives to rule well rather than loot the place or indulge insane ideological whims than the heads of state in any other system and humans naturally are less disloyal to a government where the divine is at least theoretically reflected in the ruler. you're not obeying a mortal man you're obeying an emanation of god himself.  democracy which quickly turns into oligarchy fails at scale as we are now seeing and only became the norm in the 20th century because of woodrow wilson.
United States