I never said that was my impression, as I'm sure there are also some vibrant small towns in Poland as well.

But it's fallacy to think that lots of wealth hasn't further concentrated in cities over the last 50 years. A lot of my family is from upstate NY, and I remember visiting them as a kid and feeling like they were nice places. They have all deteriorated greatly since I was a child. E.g. people always complain about how expensive housing is in the US. Well, there are plenty of cheap places to live in upstate NY - housing costs in a lot of those places have lagged inflation for decades. The problem is nobody really wants to move to Cortland, NY.

The issue looks especially clear when you compare small towns in close proximity to big cities compared to further out. There are lots of vibrant, quaint small towns on Long Island, for example, because they get a ton of money from their proximity to NYC. I often think a lot of the upstate NY towns would look just like the "cute" Long Island towns (e.g. similar architecture and history) if they had an influx of money.