Wars over economics are very different to ethnic warfare. The latter tends to be a lot rougher, and involves more widespread atrocities. The other problem with ethnic warfare is it never ends until you have either ethnic separatism, or genecide, whereas wars between state actors are resolved once there is regime change, and in wars over economics the civilian and military deaths are generally a result of chasing after strategic goals, not intentional genocide.
Couple things. First, attempting to define every major European of the last five hundred years as "economic" is reductionist to the point where the most strident of Orthodox Marxists would blush, the ironies of which hardly need elaborated upon. (First-and-a-half, the notion that "ethnic" war and "economic" war are mutually exclusive is pretty hard to substantiate; see, for a striking example, the Nazi Occupation of Eastern Europe.) Second, what "ethnic war"? You're talking about a war that hasn't happened, and which nobody has yet taken the time to elaborate on, even to the point of explaining who's involved beyond "the Mooslums". It's not comparative history if half of it is just something you've made up.
Basically sending millions of foreigners into a country who aren't coming for work and
have no interest in assimilating is a poor social experiment that's going to end very, very badly, with a lot of dead bodies in the long term.
It could be, but that does not, on the whole, describe Muslim immigration to Europe, or Africa and Asian immigration more generally. It might describe recent refugees groups, even, but why
would people in that situation be thinking about work? Why
would assimilation be at the fore-front of their minds? It might be something they consider in the long-run, but if you've just stumbled into safety after walking across half a continent because a weirdo death-cult wants to chop your head off, your first thought is not going to be "now to get me a job and a flag".
You can't reasonably take a short term trend resulting from a localised political and humanitarian crisis and use it to describe long-term, continent-spanning trends in migration.
I guess I should note that I am not completely against immigration in all circumstances. Immigration can be very beneficial in some cases. I just believe that, given the current situation, it isn't in our best interests. Also, surely you realize that accusations of prejudice and bigotry etc. are ad hominem attacks? They are not legitimate arguments, and they do not belong in a civilized discussion.
Neither does racism. If you're going to set a low bar, don't blame others for taking you at your word.