Not the US, but much of the countryside in Japan is undergoing similar demographic and economic collapse. Most visitors stick to areas accessible from airports, trunk roads and shinkansen lines, so it hasn't gotten so much international attention. But if you rent a car and drive into the mountainous interior, or outlying regions like Shikoku, you'll find plenty of emptying, aging villages, adbandoned stores and factories and return-to-the-state-of-nature decay. Richard Hendy's blog, Spike Japan, had many well-researched and beautifully written posts on this phenomenon, unfortunately he stopped updating a few years ago.
https://spikejapan.wordpress.com/