first: tone & language means this is silly of me to reply.
second: how about basically the entire existence of the US
so many examples of government & local police enforced white ethnic activism and active racism & enslavement.
fugitive slave act. legally forced segregation & jim crow laws.
Also, you were not explicitly asked or referenced in my comment so your first point is irrelevant.
Yes, especially dense.
you clearly asked "Can you give me one example where such a society was allowed?" that is past tense, not bounded to now. I answered. You are wrong.
Oh and BTW white ethnic activism is alive and well.