Casino Affiliate for US players

If I have my casino affiliate site casinos, which are directed to US players. Do I need a license? Or is it state-specific?

You need the license only if you are owner of the casino)

Yes, in US you need a license to work as affiliates in some states such as NJ, Penn and few others (for now). You can still publish casino offers targeting the whole US, but you risk to be banned from those specific states where gambling is regulated.

So, you can either play the game until it lasts, or get a license for each state (but get ready for many paperwork’s).