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MF Doom wrote:

"How on earth will they assimilate into European/Western cultures?"

And he got that right.  The young Muslim males will NOT assimilate into European culture.  Why should they?  The earlier immigrants did not, and their percentage of the population is growing.

And when our (America's) turn arrives, the young Muslim males will not assimilate here either.  Would bringing in their women and children help that?  No, current evidence is that it would not.  See Muslim women who dress in their hijabs.