From ARS Technica On April 30, 2013, the poker world saw the launch of the United States’ first legal online poker site, Ultimate Poker. But Ultimate Poker has one significant limit: it is only legal within the boundaries of Nevada. As more sites come online under similar state schemes—New Jersey and Delaware are likely next—online gambling in the United States may be poised for an explosion. It wasn’t always this way. Among online poker players, Black Friday refers to the infamous day in April 2011 when the United States brought federal criminal charges against the founders of three major overseas…