So, while esports in only 100% legal in Nevada and New Jersey, there are states in which you can access regulated esports betting: These states include Arkansas, Iowa, Mississippi, Illinois, New York, Pennsylvania, Rhode Island, Washington DC, Oregon, Montana, New Mexico, and Delaware.
Of the U.S.'s 52 states, 16 have legalized eSports betting. Four states have laws that either prohibit betting or have not included eSports as one of the sports  in betting. Some states have federal laws that regulate eSports betting.