That's not a way to look at it, that's simply the way it is, otherwise you would have offered proof of otherwise, or at least a quasi-counterargument.
Cities are born and continue to grow as economic hubs. Should that activity decline (Detroit), so will the economy around it and those whose make their living from it and thus the city.
Cities are not just the centers of economic activity, they are the drivers of it. That the poorer the State the less the population and less concentrations of it is not a coincidence.
Republican mobs are reactionary, as is the Party. Their platforms and votes tend to be against, rather than for, issues. Stoking the ire of their minions is what they do. That the States they hold sway in include the poorest is not accidental.
Funny you mention bread and circuses, because New York City is the City of Rome of today. Not just the driver of the American, but the World economy. It falls, then just like when Rome did, it will usher in the Dark Ages, but on a vaster and deeper scale. Katrina hits, Gulf State fishing and oil collapses, and the Stock Marker shudders for 3 whole days, then it's back to business as usual. 9/11 hits, and the entire planet goes into recession.
In addition to NYC, the most important cities to the World are LA and SF, although London is still kind of important too because of the opening hour of the Stock & Commodities Markets.
The next plague will be prevented by cities, because that's where science and medical and other innovations and developments happen. No one looks to the nothing States that fill the blank space between the East and West Coasts for the next miracle, whether it be that vaccine or that all important phone you typed your reply with.
Oh, snap, it's 8pm, time for me to turn on the tv to watch entertainment that was produced by the manufacturers of tasty breads and hit circuses.