Every Fifa World Cup begins with a script based on rankings, reputations and player salaries. Every World Cup also produces a few teams determined to tear up that script. This summer, the most memorable stories came from beyond the usual nations in the form of smaller sides such as Cabo Verde or Curacao, the smallest nation ever to qualify for the tournament. Their performances gave the expanded tournament some of its most compelling moments. For many viewers, the underdog has a natural pull. It...