The BetMGM, Borgata, and partypoker skins all share players within a given jurisdiction but not between states. However, Pennsylvania, Michigan, and New Jersey are three of the biggest regulated markets and partypoker has operations in all of them.
Yes, online poker is legal in the United States, albeit only in certain states. As of early 2024, only six states have legalized online poker Nevada, Delaware, New Jersey, Pennsylvania, West Virginia, and Michigan.