Nations, Empires and civilizations have never been made from one single ethnic background
Empires most definitely, by definition, weren't, but nations were and are, and civilizations certainly were. But you entirely misinterpret "ethnicity", or else confuse "ethnicity" with "ethnic background". I'm coming to that question later.
Swedes are Germans/Austrians...and before that Goths and nomads from the East. Before that they were Gauls, and even the Gauls were 3 different 'ethnic' groups
that is the crux. I'm surprised u say that. First off, which "Austrians" u find in Sweden? But whatever. The real thing is that, once again and again, I'm talking about EXISTING ethnic groups with CONSCIENCE of commonality. Yes, conscience. Ethnicity is in the eye of the beholder. You most certainly confuse "ethnicity" and "race", or "racialize", biologize ethnicity. Not a biological thing. A cultural one. I thought that was a commonplace knowledge. Every attempt at a definition of ethnicity speaks about conscience, consciousness, perception, belief, "myth of common origin", etc etc. Here are some from the Wiki article:
"An ethnic group or ethnicity is a population of human beings whose members
identify with each other, usually on the basis of a
presumed common genealogy or ancestry. Ethnicity is also defined from the
recognition by others as a distinct group.
Those human groups that entertain
a subjective belief in their common descent because of similarities of physical type or of customs or both, or because of
memories of colonization and migration; this
belief must be important for group formation; furthermore it does not matter whether an objective blood relationship exists."
Speaking of Swedes, as well as of Italians, as I said before: do Goths or Gauls or Etruscan exist as ethnic groups NOW? Do they have such identities? Does anyone identify as a Corynthian colonist in Sardinia, or as an Etruscan? Goths exist as a lifestyle movement, not an ethnic group. There are some consciously Celtic dudes in France, but they are a fraction.
Forget BACKGROUNDs. I'm talking about active collectivities. It;s like I'm saying "Let's treat animals well", and you saying "what, now u wanna dig jurassic fossils out and pat the dinosaurs on the skull?" Swedes exist as an ethnic group speaking same tongue and conscious of common history. Goths (how come u forgot further subdivision, Ost Goths and West Goths?) don't. Irish exist as a coherent, nationalistic collectivity. That's the only "host" group in Rep of Ireland, there are no other. Do u hear me now?
I suggested that when you start demarcating based on ethnic backgrounds theres no telling where it stops
it begins and stops with the question "who are you?" If you find anough people saying they are Etruscans and they'd like to have their own state, I'd have to support them, as any other group. You wouldn't compare Kurds in Turkey and Ligures in Italy. But u actually are doing that.
Do you do this even when they are in the minority but make the most noise and whining about it?
what? where? where are they in minority? In the country, in a province, subdivision, historic homeland?
That's basically the Muslim Chechen story. Do you support their 'self-determination' even though they were the last ethnic group to move into the region, least native to the region and are in the minority?
eh? did you read something and confuse it with something, or just an anti-Chechen sentiment? All three statements on the Chechens are like from the Mars. (my guess: probably mistook them for Azeris or Turks, and even then it would be incorrect).
you think you have all the answers
ha, i have the golden rule: people themselves have all the answers, just ASK THEM through a referendum. They know who they are. They know (more or less) what they want. I never said i'll take a pen and lean over the map redrawing the borders to my liking. I said: ask the people wich state they want to live in. This way u won't bother yourself excavating ethnic fossils like Etrusans. Leave it to the people living in "Etruria" to identify themselves.
Denmark and Germany had a decent amount of bloodshed over the Schleswig (Slesvig) region. After WWI, REFERENDA were held. Northen part went to Denmark, Southern to Germany. Has been quiet since. State border was rectified to correspond with ethnic one. WWI taught some lessons. WHy isn't this solution applicable in other places?