There is not a single example of a multiethnic or culturally diverse empire or state that was successful after the rise of nation-states at the end of the 19th century.
All of them crumbled either peacefully or in bloody wars.
Why do you think such a bureaucratic monster that no one really wants would be an exception?
Maybe we can try it again in the 24th century, when the humans evolve enough, but for now, your best bet for a successful country is either an ethnonational or religion-national state.
All of them crumbled either peacefully or in bloody wars.
Why do you think such a bureaucratic monster that no one really wants would be an exception?
Maybe we can try it again in the 24th century, when the humans evolve enough, but for now, your best bet for a successful country is either an ethnonational or religion-national state.