That is the very reason empires have all fallen, if there is not a single language and culture, the best thing to do is to divide up the country along ethnic and social lines like happened in greater Serbia (usually called Yugoslavia), Russia, and the parts of the German and Austrian Empires that were run by German minorities. The US plus Switzerland found a single way to do that by decentralizing central government plus beginning the procedure from the local up with a single language (although Switzerland, with their semi-autonamois Cantons, has made it work with four languages) making ...