>>1519286>what rules, practices and laws created the old citys in EuropeNone, you literal retard. I explicitly told you it was happenstance.
>would anon do [to] create such city in a modern worldYou'd need to redo from the group up the city planning across all of the us. To do that you'd need to bully both private homeowners and interests groups into submission. To do that you'd need to a strong-armed, strong-willed stable government with a tight grip on power and plenty of loyal followers. Also since you plan to cram millions of people in close proximity of each other you must smooth out social interactions as much as possible hence forget multiculturalism and multiracialism: the more the people are in socially in sync with one another (to a human degree) the better. In other words you'd need a modern version of fascism; you could try modern communism but then you'd probably spend more time, energy, and public resources to keep people from simply fleeing your shithole country than you would on your dream cities.
Fascist Spain succeeded in building mid-high densely populated cities; they did it for agricultural autarky, preserving farmland was a matter of national security, rather than ideal city planning but who cares? The overwhelming majority of Spaniards today live in apartments they own, and happily so. The US is currently flirting with modern communism, in some states more than others, and surprise surprise it's not going very well, is it?
>https://www.cnbc.com/2019/02/12/growing-number-of-californians-considering-moving-from-state-survey.html>https://www.sandiegouniontribune.com/opinion/the-conversation/sd-california-losing-low-income-people-gaining-wealthy-people-per-report-20180221-htmlstory.html>https://www.sacbee.com/news/databases/article236910698.htmlCheer up though there might be a blowback to all this leftists power grabbing like in the Weimar Republic; you might be only one race war & genocide away from your dream American cities.