Please include in your city definitions some comparable facts like:
population (urban and metropolitan), area, density, percentage of green or water,
Try to get data of the two cultures in the other city (hetereotopias). For example how many mexicans live in San Diego or work there.
The data should be graphically all the same:
1 human being stands for 50.000 people
the area should be the actual urban outer line in a scale 1:3.000.000 (grey for urbanity, green for nature, blue for water)
I think the density becomes clear by putting the humans into the area.
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