That's a curious and a bit off topic phenomenon: in some countries dominant class have tried to form people to create a real country, that's Russian Tsar Peter

That's a curious and a bit off topic phenomenon: in some countries dominant class have tried to form people to create a real country, that's Russian Tsar Peter the Great for instance that create a sort of "Intelligentsia" to create a united country and that's result in Russian October revolution (that's was led in fact by Peter's Intelligentsia not by "proletarians") in Italy we do the opposite and the country is still not really united. In Germany even if there were far less language differences and even if Germany was united "before" people coming from ex-DDR zone still act "as strangers" in the ex-"west Germany" zones. I never really study history in that sense but decoupling parochialism and substantial differences between people's in a country may be an interesting exercise :-)