Actually Wager Profits (SciFi, Breakaway) doesn’t accept U.S. players anymore. 
CWC Affiliates does, however. I can’t say enough good things about the CWC team — they’re really great. Casinos include Club USA Casino, Club UK Casino, Club Euro Casino, and the brand-new Club Asia Casino.
400 Affililates, SuperiorShare, and Pantasia Affiliates (all Rival software) accept U.S. players from all 50 states.
Hype Partners (Player Preferred software) takes all U.S. players too.
Revenue Giants accepts all U.S. players. Aff manager Danielle is great to work with. Casinos here include Slots Village and Winward Casino.
As Aksana said — most Microgaming casinos accept players from all but the 11 banned states. Intertops Casino accepts players from all 50 states. There are some MGS casinos that don’t accept any U.S. players — namely, the WagerShare group of casinos, and 32Red (32Red Casino, Dash Casino). Their loss. :stirpot:
Casinos powered by OddsOn software accept all U.S. players. Examples include Golden Casino and Hot Pepper Casino. Casino Coins is another option, but I don’t recommend them. Their parent company looks like they’re in deep :bullshit: financially.