I have checked all twelve Casino Rewards online casinos and all contain the following when you check their Terms and Conditions section of their websites.
Terms and Conditions:
Promotion Terms And Conditions
Any sign-up bonus is only valid on your first deposit.
Residents of the United States of America shall not be eligible for entry to any of the CasinoRewards promotions at any time.
I have updated all my Casino Rewards online casinos to include thart message and as well to let players from the United States realize that they may still play but without any bonuses for first time players or any other promotional offerings.