To expand on what I was saying, maybe multiculturalism works in some cases and not others. Maybe some cultures are compatible and others are not. Zionism and Islam seems to be incompatible. East Asian and European culture on the other hand seems to be relatively compatible. Not perfect, but workable.

What would be a sign that cultures are not compatible? How about interracial violence, slavery, segregation, race riots, one group having an unusually high violent crime rate or poverty rate. Those would seem to be signs that cultures are not compatible. What nation seems to have had problems with those issues? Any idea? I could think of one very prominent example.