What online poker sites are legal in the U.S.?

The answer to this is a two part question, as there are regulated and unregulated markets currently operating in the USA. For regulated markets, let’s focus on New Jersey, as that is the largest one and all sites operating within will soon be expanded to other regulated states, particularly if there is the predicted shift of combining player pools from other state markets, like Nevada and Delaware (already in the works with 888).