Americans have no true megapolis scale cities by population. The biggest American city, New York, is number 28 on the world list. London is 27. The first “western” city is Mexico City at 23.
Of course by GDP it would look different. And “city” is not consistently defined.
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The first non-Asian city is surprisingly Moscow at 7. I wonder if the list would get reordered if you did greater urban regions rather than the formal city limits
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Certainly, American MSA's are better at capturing what is on other places considered a city
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