Yeah, as far as I know, Alex Pagaluyan is about the best snooker player from North America, and he wasn't able to get through the qualifying for a tour card last year. Way easier to migrate from Snooker to Pool and make it to the top than vice versa.
He got fairly close. I believe he was the second best finisher of those who failed to qualify. I'd like to see Alex try the IBSF World Championships as he would probably do quite well.
His best performance on the tour thus far is a 6-2 (high break 103) loss to Matthew Selt. The top 128 in the world is a big step up for anyone.