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What city do you live in, exactly?
I live in Los Angeles - one of several metropolises that I've lived in on several continents - and the vast majority of second and third generation immigrants I've met have had no trouble assimilating into their host culture. As an immigrant, in fact, I have struggled to find any zero or first generation immigrants that do not bemoan that their offspring are completely detached from their culture. They consider themselves lucky if their grandkids still speak their "native" tongue at a primary school level.
What I have seen everywhere, however, is a lot of small minded people who are only capable of differentiating each other by superficial ethnic stereotypes, dominated by skin color and religion. They've always got "plenty of evidence" that they "will not list here due to it being tangential and often mistaken for malice."
My apologies if I've got the wrong impression, but perhaps your understanding and methods of "assimilation" are fundamentally flawed.
Works great here in Canada. My neighbors are Lebanese, Iranian (although he calls himself Persian), Polish and Brazilian. All very Canadian, which is not a synonym for assimilated.
It is also weird how you call it racially segregated when it is possible for white Americans to immigrate to India and obtain an Indian citizenship and then have trouble going back to the US.
The closest thing we have to slavery is civil wars where prisoners of war are being forced on overloaded boats that are heading toward Europe. These people probably suffer from the same pain that African American slaves have suffered from but they are not slaves, they are refugees and rejecting them will just result in more suffering, not less. You can call this human importation but it was not initiated by the receiving nations which were actually tightening their borders.
I don't follow your comment about slavery, either. Where did they say it was a solution to labor problems or anything else?