Sports gambling in America is big business. It is also, largely, illegal. According to the National Gambling Impact Study Commission, nearly $400 billion is wagered on sports by United States citizens during a given year, with only $3.5 billion of those bets being placed at legal books in Nevada.With only one state offering legal sports betting, how is it that U.S. citizens are able to gamble so much on games?While a significant portion of illegal...