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Immigration is almost certainly the first step. There's apparently a lot of anti-immigration feeling among the voters, and the Democrats will likely feel they have to cater to this rather than fight it, so there's likely no public or political pushback. You start with undocumented immigrants, because no one will defend them. Then when that isn't opposed, you start detaining/deporting people who did follow all of the rules except for having the "wrong" skin tone.
