Well to be honest I think that the jury is still kind of out in that regard, at least somewhat. I mean in the case of 3 of the countries that you listed, Canad

Well to be honest I think that the jury is still kind of out in that regard, at least somewhat. I mean in the case of 3 of the countries that you listed, Canada, the US, and Australia, are still very much majority European descent white. And even with this majority you can still see what happens when other ethnic groups become large enough. In Canada, the francophone minority has repeatedly tried to separate and form their own nation, and in the 70s created disruption to such a degree that the government declared essentially martial law in the province of Quebec. In the US the treatment of the African-American ethnic group has been terrible to say the least. And we'll see what happens as the latino ethnic group continues to increase in size, there is already some reactionism in the form of laws passed in Arizona, etc. The fourth nation you listed, India, had to separate into two separate nations that have been repeatedly on the brink of war on basis of religious groups! So I think it is easy to say that western nations have been able to work and experience peace, but in most cases there is either one ethnic group that is a clear majority and all other groups bend to its will, or there actually is a bunch of friction and conflict when those minorities become sizable enough. Obviously not to the point of civil war, but I don't think we can say that things are just "working" elsewhere.