This edition of the SheBelieves Cup will be the third since the event launched in 2016, and it's likely to be the most important yet. Because the tournament was designed to be held in years when there isn't a World Cup or Olympics, it might not be played in 2019, when France will host the World Cup in the summer. The same is true for the mid-summer Tournament of Nations, in which the U.S. brings Australia, Brazil and Japan here for a similar round-robin event.