>We can't undo mass migration
Migration implys movement. Keep on truckin'.
>We can't undo race mixing.
We can make people face the consequences of their actions and spread awareness of the horror of it.
I think if we banned dual citizens from voting/working in gov/juries/politics, it would take care of itself from there.
Also, a 'dual citizen' is someone who has parents from different nations, ie, race mixing. As such, should be excluded from any government roles in BOTH nations.