There is a distinct line between nation states and multi-cultural empires in history. When drought and famine, political crisis, prolonged wars etc happen to a nation state, during the time period Victoria covers, the population overthrows the government, switches king for president, conservatives for communists or fascists. When it happens to a multi-ethnical/religious/cultural society there is secession and separatism.The question of minorities is not "how much of an effect did the minorities actually have" - because in the case of Scots and Welsh, the differences faded drastically in Victorian times.
The question is: "how much of an effect would you see when everything goes to hell?"
Sure, you can probably find an exception, but in a vast majority of the unrest and revolts of this era the golden rule is as described. Spain, France, Italy, Germany and Russia are examples of such nation states where revolutions resulted in change of government, not secession. That being despite the fact that both Italy and Germany went through their infancy during this period.
In Austria, OE and USA revolts resulted in separatism. With the nationalism of the Victorian era it is very hard to justify a "what if" where Galicia separates from Spain. The only revolt in Galicia during the whole 19th Century was the Solís Uprising, and that was rather an uprising in Galicia than a Galician uprising, the leader of it being a colonel in the army, without separatist intentions who indeed flirted with the Galician independence movement, but was never a part of it.
So why Galician culture? Still don't see any reason for it. There is nothing suggesting Spain would dissolve during any of the conflicts during the period. Spain survived as a state through the Carlist wars, revolutions and counter-revolutions, political chaos and republican stagnation during the 1840s-1870s, and the eventual restoration to monarchy. During the 19th century Spain went from having been one of the European superpowers, matched only by Austria, France and Britain, to, at the dawn of the 1900s, having become one of western Europe's poorest and most backward countries. Still there was never any organized separatist movement (except the basque) during this whole time.
This is why I think cultures in nation states should be kept at a minimum. If a player decides to play an authoritarian dictatorship or absolute monarchy as Spain or any other nation state he should not be getting rebels who want independence, he should instead be getting monarchists, republicans, liberals and socialists.
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