this is reply i got from live chat:

Chat Information
Marco: Thank you for contacting Belle Rock Entertainment and welcome to Live Chat SuppMarco: How may I assist you today?
trbr****: hello, can u tell if USA players are allowed to play for real money at river belle casino, please?
trbr****: im not from USA, but im reviewing this matter for forum members
Marco: Would you confirm your telephone number and your email address please ?
trbr****: np
trbr****: ******** ********
trbr****: ok?
Marco: Thank you for waiting Nikola.To get an answer for your question you have to contact your local government regarding this issue.
trbr****: like i said im not from USA, im only reviewing this matter ..
trbr****: some USA members are interested in registering with your casino..
trbr****: thats why i asked if they are allowed
trbr****: usually casinos have list of allowed states
trbr****: so i assume u have one too
Marco: The only way you can get an answer is to contact the US government (Jurisdiction)
trbr****: ok , thanx 4 your help