Most immigrants do integrate; it takes time though. I know you're talking about Muslim immigrants, but they're the only group who generally do not integrate over time and even so we've yet to see if they will, I mean one can guess and make predictions, but we do not know for a fact, yes or no, whether they will integrate over the next few generations. And no, Europe isn't doing what Rome did; while the end result of immigration may be that 'other countries' are being formed inside our own, that is not the stated policy of immigration. Even if the end result is the same, it is still not the same situation as the Roman use of Foederati was undertaken without any expectation of integration by anyone, the policy and means were different. This is why I'm saying it works as an analogy in the sense that you may vaguely compare the two things, and chalk up what they have in common, but that they are not the same, and our situation is different to what theirs was.You think immigrants to Europe integrate?! That has to be a joke. And yes, Europe is doing the same thing as Rome, we are literally moving other countries inside ours.