The North American region of Valorant will not be on top of the game for very long. The reason for it being on top initially is the reality that North American Counter:Strike is dead. Without this being the case, there wouldn't be much of anything going for NA, much less Valorant. The pool of professional North American CS players was massive for orgs in NA to choose from, able to take over talent that is going to be far ahead of any other region for the near future. Now that some time has passed, we've seen NA really not grow at all as a region basically just leaving Sentinals as the only real bastion for NA dominance abroad considering their run in Iceland. Unfortunately for them though, it's basically been proven with time that the teams they did beat from abroad, I.E. Fnatic and some others, are not even close to being dominant in their region. Fnatic was knocked out by Liquid who just got beaten by a 25th ranked Navi for crying out loud. The supposed to be dominating teams in EU are being destroyed by the new teams such as Ascend who is looking incredible at the moment. Same goes for Gambit, who looks very good.
Point is, though, NA supremacy will go to the wayside once everyone else gets that time to catch up from the huge pro player deficit they were in coming to Valorant in the first place.
EDIT: I was correct.