I live in Okla and the casinos had a huge effect on pool, especially the action part of it. Soon after that they changed the smoking laws to where you had to have a full bar to smoke and that killed a lot of places too. Its not just one thing but a bunch of little things that killed big table pool.what sent pool into the dumps in the u.s. is the opening of casinos all over. pool players took to them in droves and keep themselves broke and out of action.
also many took up poker where you had a chance of winning more and had constant action.
the young players had internet and phones to entertain them and were more social which doesn't fit into pool.
we have had some resurgence with leagues but most of those are occasional players and bangers from what ive seen.