I think another good example would be the craft beer industry. The brewers association directory[1] lists around 200 regional and large breweries in the US, and somewhere around 5000 microbreweries and brewpubs.

Granted, some of these are more than 20 years old, but the movement grew the most through the early 90's[2].

[1] https://www.brewersassociation.org/directories/breweries/

[2] https://www.brewersassociation.org/brewers-association/histo...