It wasn't long ago since MasterCard announced that they are going to block Americans from making transactions to online gambling sites. Now, MasterCards biggest opponent VISA follows and block their American customers as well. That both the credit card giants VISA and MasterCard have decided to block Americans from making transactions to gambling sites is a clear sign that UIGEA (Unlawful Internet Gambling Enforcement Act) will soon come into effect (1 June 2010).
We will have to wait and see how effective the UIGEA law will be since there are a lot of problems which the american authorities need to solve before the law will be effective - in other words, stop americans from finding other ways of transferring money.