In about a minute's worth of searching, the national professional league formed 1976 combining/replacing older regional leagues, there's promotion and relegation to/from a second division (and 3rd, 4th, 5th...), looks like most of the teams were established 1940s, 50s, 60s, earliest I saw established 1916. I don't know if there are any recent franchise teams or if that's their style. I don't know anything else, never followed the teams or league before, but there does seem to a longstanding historical tradition but now more $ & £ & €. Shame though the suddenness of all this is quite disruptive to the market and raises questions of sustainability not just for that league but for average teams and leagues across the world