You do not stand on a foot which is in one dimension you stand on an area which is feet squared .
Just read up more on the square cube law man .
It explains why ants can lift 5 X their body weight and why elephants are relatively weak for their size and sluggish.
It also explains why megastructures in earths gravity are increasingly fragile as they are scaled up.
PS . I dunno why you are bringing up US cities sizes . A massive monolith concrete foundation is very different from a scattered layout of houses built with wood and cardboard.
he brought up the city size coz i said that 50km tall manmande structure, that has to be like a mouintain will take up most of murrica as its base.
I was short-handing it a bit, i am not exactly sure because i do know that Olympus mons is about 21km tall and covers an area of 300,000 sq km, which is basically a Madhya Pradesh sized mountain and the long side of the mountain is almost 1000km long before it reaches ground level.
Even with engineering tricks, i'd say that a 50km yankee-tranny-kaala mountain will take up at least 2-3 times that land and distance but i may be wrong lol
I havent actually calculated this using square cube law and youngs moduluses, so its a bit of a shot in the dark from me.
But yea, if this chap thinks we can make a 50 km tall man colossus or 50 km tall standard proportions skyscraper, his building material better me of near neutron star density else it will collapse. lol.