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[–] The_Prophets_Profit 0 points 3 points (+3|-0) ago 

Multicultural trade hubs on the borders between ethnically pure nations would be fine.

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[–] WD_Pelley 0 points 2 points (+2|-0) ago 

Exactly, but even then they should only be certain parts of the city instead of being the entire city. Ports would be the same way.

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[–] 18675859? 0 points 1 point (+1|-0) ago 

Tito's Yugoslavia being a case in point.

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[–] WD_Pelley ago 

Or Singapore (although it's about 75% Han Chinese so they at least have a dominant majority group).