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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New York is in top 5 worldwide if you look at metropolitan population. "City proper" is a meaningless comparison metric as the definition differs so much between countries. The US tends to have particularly narrowly drawn city borders.
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Here's Wikipedia's ranking, puts NYC in top 10 but not top 5. Tokyo still number 1.
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I spoke too soon - in the most recent data, NY is #9 in metropolitan area.
en.m.wikipedia.org/wiki/List_of_m
And #8 by urban area
en.m.wikipedia.org/wiki/List_of_u
But there's a whole bunch of cities in the 20-25 million range on both measures, so no big differences up and down.
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