This World Cup will be the largest gambling event in US history. According to a PwC survey, 58% of Americans who plan to watch the World Cup will also plan to place a bet on a game. If you're reading this, there's a good chance you're considering one yourself. An expanded field of 48 teams means more matches than ever, creating more opportunities to wager as sports-gambling fever is in full force across the US, one of the host nations.