There is another unexpected consequences. I'm used South Africa as the example since we've had 32 years of legal and social suppression.
The white population initially shrinks as the ones with options move to better pastures. The rest learn to start their own businesses, invest in each other, and live without doing lucrative contract business with government and collaborator corps.
It is hard, painful and costly, but forges a resilient, self-sufficient people with a diaspora network.