The urban core of most American cities are pretty hollowed out and artificial in my experience. It's changing slightly, but I encourage you to see some of these mid western cities that don't get much limelight yourself. Have a night out in Cleveland, Ohio, as I've done several times.

All will seem pretty standard, you go to a bar on a street with four other similar bars, then you realize that these four bars are the only places with people in them in the entire downtown area. You leave the bars and walk a block and you can hear your footsteps and thoughts echo off of the empty blocks. You might be lucky to see another soul on foot. There is just a lack of life in a lot of American urban cores, and that's not a feeling but a fact backed with population data. Cleveland in the 1950s had nearly 900k people living in the city. Today it's a bit over 350k people living in the city, a large portion of it is literally hollow (or demolished and converted to surface parking lots) due to large swaths of the population moving to new suburban developments in the 1950s, and a lack of immigration back into the urban core. The overall metro population of Cleveland has been pretty stable, if declining, but the city itself only appears as a city from 9am to 5pm, and during the odd sports game, as a result. Restaurants and stores might only be open for weekday lunch because there isn't foot traffic otherwise.

This isn't true in every city, however. For instance, Los Angeles experienced a similar white flight effect with the development of their surburban neighborhoods, however in the wake of this population shift, immigration continued to occur and the population continued to rise at double digit rates every decade. Now, the former neighborhood of the Los Angeles elite of the 1920s, Westlake, is a thriving community of central american immigrants and the densest part of the entire city. The same cannot be said about the Cleveland analog, millionaires row on Euclid Ave, which used to count Rockefeller and Carnegie among their storied residents.