Nice sound byte. Convince me. Name some States which were divided along ethnic lines and new countries formed where the population is worse off AFTER the division than before or during.
thete is a diffetence between dividing along ethnic lines and forced population transfers.
Sure. So give me some examples. Convince me.
Ok. Forced population transfers. Are these people better off?
Typically when this happens people lose home, status, community and livelyhood that is never fully regained. This isnt even looking at the bloodshed and agony over loss of place and heritage.
A small scale example can be found in those communitees in India and other areas affected by rising sea levels and increased flooding. Rather than rebuilding governments are buying them out and or forceably moving them to inland towns and urban areas. But these are agricultural people who no have no land or livelyhood. They end up among the urban destitute worse off then they were before and many don't recover.
Another example is that of the Mizrahi Jews. Prior to being forceably expelled they one of the best integrated and successful Middle Eastern minorities, they had a degree of wealth and status all of which they lost upon expulsion. In Israel they face discrimination from other Jews, an erosion of their culture, and they make up a disproportionate number of Israeli Jews living in poverty. Are they better off then if they had never been expelled?
An ongoing example is the forced and horrifically violent expulsion of the Muslim Rohinga from Bhuddist majority Myanmar. They are typically small farmers, agriculturalists, small merchants. They have lost land, home, livestock and the means of livelihood. They are destitute refugees in a very poor country that shares a common religion. Are they better off? Is Bangladesh?
I'm sorry for going a bit off-topic but this is a dishonest claim, usually twisted by anti-Israeli organizations and the old generation of politicians who experienced difficulties, real ones, upon moving to Israel.
A couple of things to make clear:
1. Any big community that moves to another country experiences difficulties for 1-2 generations.
It's simple math I don't think I have to explain. The same was discussed by C.G. Jung regarding European societies. It's a natural human condition - not a state policy.
2.
"One of the best integrated and successful Middle Eastern minorities" - Jews tended to be more educated than the rest of the populations and successful everywhere in any condition.
Yet till the last days of Moroccan Jewry (the MOST wealthy and integrated) they still lived in Mlahs - officially segregated ghettos. A Jew walking out the Mlah into Muslim areas had to put his shoes on the shoulder to differentiate himself. Hertzl's grandfather was serving Rabbi Elkalai - the first visionary of modern Zionism who had a set and detailed plan for re-building Israel. His plan was initiated by the order of Rabbi Haim ben-Attar - a Moroccan sage who left everything behind to move to Israel, and made journeys through Europe to convince Jews join him.. What initiated this - Arab pogroms! What was Rabbi Hami ben-Attar's order - that upon the first sign of attacks on the Jews they MUST leave and go to their homeland to save themselves. It was the 18th century. Many don't realize that Arab and European pogroms occurred almost at the same period if time. Yes they were Kings' advisors, of most importance for setting international trades and relationship, physicians etc. but Stalin too had Jewish doctors...and we know how it ended.
Another vivid example is Haim Ferhi - the most influential Jew in Ottoman Syria, read about him, and read about the Damascus affair, as a result of which were initiated the first Zionist international organizations.
It was real apartheid, both in Europe and Middle East, to say they were most integrated- is disingenuous and offensive.
3.
"In Israel they suffer from discrimination" - not discrimination but natural integration difficulties. For example the million Soviet Jews who arrived in the 90's were in direst situation compared to Soviet Jews who moved at the beginning of the century, or even during the 70's.
Inheritance is a key factor here , it takes 1-2 generations to stand firmly and pass security to Your offspring.
4.
"Erosion of their culture" 

In fact - Israeli Jews are mixed 50/50 Middle eastern and Ashkenazi - through intermarriage, I'm an example.
Israel is a real melting pot - for example the most common surnames are Mizrahi, our most successful singers are - Mizrahi, we predominantly pray from Mizrahi prayer-books (even in Ashkenazi synagogues).
On the other hand if You go to Ukraine on Rosh haShana (where Rabbi Nachman is buried) You'll see 90% of Mizrahi and Sephardic Jews from Israel, the same trends go in the "other" direction. It's because we're a nation.
On the other hand Arabs still have difficulty to marry someone from, or move to another Arab majority town because of 'Mush milna' - not one of us in Arabic. A distance of 50km is enough. This is the reason why they demand to be called refugees while living in the same country - Arab tribes have been historically violently fighting each other over everything, the tribe loyalty comes before any social structure, the nation and even Sharia courts.
5.
"Disproportionate poverty"- maybe, but frankly I can't see it. There's no real poverty in Israel other than by choice. And many do take that choice to go an be Torah scholars, eat bread with butter and sleep on thin mattresses. Another point is that Israel was built by a majority of Ashkenazi immigrants, who arrived earlier en mass, their advantage is natural due to time frames, and the fact that secular education was more prevalent in Europe than in Middle East. Compared to Mizrahi Jews who immigrated in the 50-70's, Soviet Jews from the 90's are only finishing their integration financially and mentally.Though it's a very quick integration - 1 generation only, if not a record in human history.
One other key factor is understanding that Israel, in the 50's-60's (when many Mizrahi immigrated) experienced an austerity period. There were no resources to build houses fast enough for the new immigrants, and all Israelis were receiving limited portions of groceries by talons.
This is very disingenuous, and poisonous to suggest these people would be better off staying in Yemen, Morocco or Iraq. It's the same as when people suggest Jews were better off in Eretz Israel under Muslim rule, neglecting that this was the most impoverished, neglected, wild and violent region of the Ottoman empire for all inhabitants.Compared to all those other places where Jews were usually left alone during inter-Arab fighting, in Eretz Israel the impoverished community was systematically impoverished by the govt, and the local Arabs who targeted them in every war, even when uninvolved.