The article I’ve linked below is not about what most of us would think about as a “collapse” or other catastrophic event. It’s about the effects of a Civil War in the U.S. which has been bandied about more in the last 6 months than any time since 1861.
Regardless of your political persuasion the consequences of such a war will be pretty horrendous for everyone involved and for the rest of the world as well
The most useful nugget of information to glean from it is the recognition of the complete vulnerability of the larger cities and how completely dependent they are on the rural areas of the country and on the transportation network for their most basic day to day existence.
Bottom line is that in the event of some kind of catastrophic event that requires you to become self sufficient the city is not the place to be. If you are a city dweller or on the periphery of one you probably need to devote a significant portion of your long terms survival plans on how you’re going to get away from there and where you’re going to go.