There’s a wonderful line in Ernest Hemingway’s The Sun Also Rises when a character named Mike is asked how he went bankrupt. “Two ways,” he replies. “Gradually, then suddenly.” For decades, Americans have been gambling on sports – just not with ease. The sportsbooks of the Las Vegas casinos hummed away, bets could be placed if you knew the right guy locally, and offshore websites have been an option for the more digitally savvy in the past 20 years.