re: #48 Jay C

Nope: a quick wiki reveals that the 10 largest US cities have a combined (est.) population of about 25.4 million. Although that’s probably just the “city limits” numbers: I’m sure that when one includes “metro areas” that figure would go way up.

BTW, Buenos Aires lists 3.8M* in population, but 16.1M in the “Greater” area.

*which would make it the second-largest city in the US

Chicagoland has about 8 million people.