I still think the single-language ethnostate is the most ideal form of country but there are various factors that contribute to a nation being less successful. In Africa; Burundi, Rwanda, Morocco, Lesotho, Eswatini, Botswana & maybe Egypt can be considered "nation states", but are not as wildly wealthy nor have as high a HDI as Greece or Spain, for example. So what is the problem? It's just my theory but I think here, we have a cultural problem where in some lands untrustworthy leaders, external destabilising or geography have played a big role in keeping a nation state underdeveloped. This is not only prevalent in Africa's nation-states but in countries around the Caucasus & eastern Europe where the culture sometimes revolves around corruption & being downtrodden. Sometimes a nation has been oppressed & it's people depressed so long that the people do not see their country being any better because they believe "This is just how we are."...