> Absolutely. Pick any city of your choice. New York, Los Angeles, London, Joburg, Bangalore, Hong Kong, Lima... Are the ethnic demographics of the city not sub

> Absolutely. Pick any city of your choice. New York, Los Angeles, London, Joburg, Bangalore, Hong Kong, Lima... Are the ethnic demographics of the city not substantially different from those of its rural surroundings? Yes, but are they all ethnically skewed in the same way? If the concern is genetic factors, it doesn't really matter if cities have different ethnic demographics than rural areas in all two hundred countries as long as the rural/urban racial skew is different in the different countries. For example, in the US rural areas may tend to be whiter than urban areas, but in countries that aren't predominantly caucasian, the opposite may be true.