USA casinos are known all over the world for great gambling opportunities and fair games. The US gambling has a long history. If you read it you will find out that throughout the history they worked hard on figuring the best conditions for both sides. The authorities of the country and gamblers. In the very beginning the government observed big sums of money going round its hands and complaints from deceived players became frequent. So, the government had enough reasons to forbid gambling on the whole. However, later on they realized that it did not work properly and the profit from casino gambling withdrew into the shadow, though, the number of complaints decreased significantly. So, they had to consider their decision concerning gambling activity restriction once again.
With the advent of the internet it became more difficult to control casinos turning up. Today they have to get a license to lead their business legally. US legal online poker, thus, is not such a rare thing. Though a license costs much casinos take care of getting them and offering their subscribers high quality poker games without the fear of being caught on doing something illegal.
US online poker rooms are mostly the copies of those in the real world. That is the good count to offer the rooms that have the features of real ones. This is how they make sure that all those players who have ever gambled at those rooms in traditional casinos and favored them much will stick to those rooms out of nostalgia.