I'm not saying that's what you said, I'm saying that what you say requires that. I am attempting to beat a Reducto Ad Absurdum into your head, showing that your theory is little different from Communism in that it's not possible to arrive at because its premises are wrong.
If you give the expelled a state, the history suggests they'll be turning it against those who expelled them from their historic enclaves. As there's rather few of these cases with clean lines, that'll be enormous stretches of your world in such a situation, which will almost immediately turn into war as the grudges of the expulsion are resolved by conquest and slaughter.
No, it does not require it.
And minorities always turn against the state they live in as soon as they think there is something to gain from doing so. Doubly so if they already have a state, but it is not the requirement.
Generally speaking, doing a "population exchange" to make ethnic and national borders match was the best hope for long-term peace between countries (e.g. post-World War 2 Eastern Europe, post-Greco-Turkish war Greece and Turkey). Whenever that was
not done (e.g. post-World War 1 Eastern Europe, entirety of Balkans after either of the world wars) the outcome was instability, conflict and open warfare.
Without borders, it wouldn't have worked because the US could hunt them down immediately. Without co-ethnics in the destination regardless of borders it wouldn't have worked because the locals wouldn't be obstructing investigation.
Yes, because United States have been
oh so successful in hunting down Islamic terrorists in the occupied Iraq, Afghanistan and on their own soil.
When your ideas
require actual fantasy to work, that does not speak well to their applicability to real world.
You're insisting your theory is more important than reality. It very much needed the borders to lock small peoples in with the big stick waving plurality. That they're the "wrong" borders does not change that they exist today, and something has to be done to make them stop existing.
Yes, and without borders the small people would be locked in with the big stick waving plurality anyway, because most of them had no way of leaving anyway.
There is a reason why basically every intelligent social animal has territories and borders. Attempting to disregard millions of years of evolution for the sake of some religious ideals is sheer stupidity.
Focusing on the cause leads to the symptom withering on its own with vastly less disruption, which any attention to the interruptions around COVID-19 will show is utterly essential to putting your theory into practice. Because anything that requires anyone of any importance to shut things down rapidly damages the incredibly difficult to repair system we need to feed ourselves, and these are projects that historically take years to get anywhere with universal violent pushback. For all the Trail of Tears' was rather completely impotent...
Cause is our own elites being genocidal control freaks who only care about their own power.
How do you solve
that quickly enough?
And this matters for the large masses of "Spaniards" who converted so thoroughly as to adopt the naming convention or the Arabs and Moors who did in fact convert to the "Spanish" culture why, exactly? Again, your argument relies on it being actively impossible to have a stable multi-ethnic society because assimilation is always bullshit, yet here you are highlighting a case where assimilation went so far that the "reversal" left a novel admixture crucial to why there even exists an overall "Spanish" identity instead of the fractious kingdoms the Arabs conquered.
Both of these categories, while extant, were in significant minority. And yes, it is impossible to have a stable multi-ethnic society... if people assimilate into new ethnicity,
it is no longer a multi-ethnic society. But there is a limit on how many people a society can assimilate in a certain period of time, and how distant said people can be from the native populace for assimilation to be viable. Merely waving a flag and reciting an oath does not mean they have assimilated.
And considering Serbs
did not assimilate into Croatia after 500 years, and that there are still practical psychological differences between genetic Croatians and Wlachs-assimilated-into-Croatian-ethnicity some 1300 years after arrival of Croats to these lands... yeah, there are some significant limits.
It only looks that way because the elites force it to, the truth of the matter is that polling on the issues has shown that nearly the moment the migration happened the masses didn't actually want it. The roadblocks are politeness and non-violence, not incomprehension that Jihadis are an active enemy. Both of which are breaking down recently, with the AfD showing that what is practically ground zero for the worst of the brainrot is at risk of giving way.
Problem is that majority of people are basically apolitical. It may be, as you said, politeness and non-violence, but it is a major issue.
...As if countries have never patrolled their waters to extract tolls. Even without getting into the likes of the Barbary Pirates, the entire reason we have the phrase "showing its true colors" is because naval rivalries were so intense that lying about your nationality was a routine business demand. It only works this way because of the United States Navy making it so, which cannot happen with the world locked to ethnostates as no one ethnicity alone can get that big a stick to force trade to go smoothly.
You keep making statements that require the "melting pot" never work, always being impossible, despite all the times it actually happened. Frequently despite the participants actively trying to avoid it. You think nation-states end conflicts in themselves, ignorant of how much of that revolved around welding local identities together in the very process you call genocide and seek to avoid while discarding hereditary aristocrats as foreign impositions and thus being mutually exclusive with the monarchies you so adore.
You really have no clue, do you? Countries patrolled their waters, yes, but there
always existed the concept of international waters - if for no other reason than because it is simply impractical to patrol
everything.
And I never said nation-states end conflicts in themselves. I said that they
limit and manage them, make them more predictable and less generally destructive. Also, nation-states and ethnicities are
not one and the same. Nation-states are merely
political expressions of will of ethnicity for statehood. Major advantage of monarchies is precisely that it
divorces the ethnicity from political nationhood, thus removing one of major causes of conflict. Just for example, Croatian ethnicity first had two duchies (Pannonian and Maritime Croatia), then one kingdom (Croatia), then
three kingdoms (Croatia, Slavonia, Bosnia)... but throughout all of this, consciousness of the common ethnic origin never went away. And when Croatian kingdoms accepted the Hungarian crown, they still retained basically all elements of their sovereignty - the only thing foreign about the 15th century Croatian government compared to the 10th century one was the fact that the king was a foreigner. But Croatia itself (or rather, each of three Croatian kingdoms) still kept its language, its culture, its laws, its army and basically all major signs of national sovereignty. Under a democratic system, where state basically equals the people, something like this is impossible. You either have an ethnic nation-state, or you have a tyranny. No in-between.
Google "personal union" if you still don't understand what I am talking about.