It is impractical for all members of large societies to vote on all matters.
Most countries adopted forms of Representative Democracies, or Republics.
The term is republic ("democratic republic" or "representative democracy") and is the basis for all modern democracies. Many countries elect separate legislatures and executives, while others (parliamentary form) combine the two.
The adverb form "reasonably" can mean "as considered by reason" but has the modern usage to mean "somewhat" as applied to an adjective.
No our United States is a combanation and not one democracy.
The possessive form of the singular noun representative is representative's.example: The representative's appointment is at four.
So-called democracies
Europe's old form of Government was the Monarchy, but most of them today are democracy
That is a matter of opinion. Enlightenment thinking is responsible for the way that modern democracies function, industrialization is responsible for the way the economy in those democracies (and in other 'modern' countries) functions. You could however argue that the form of industrialization that the industrial revolution started is already changing under the influence and possibilities of today's digital age; but that the democratic form of government that is a result of Enlightenment thinking still endures and will continue to do so for a considerable time. So it's debatable which of the two is more 'significant'; Enlightenment is at least more enduring.
Representative democracy
monarchy
A Republic
The United States is a representative republic.