American FootballThe gridiron game — America's most-watched sport, from Friday nights to the Super Bowl, now Olympic-bound as flag football at LA28.
RugbyThe handling code of football — 15-a-side rugby union, Olympic sevens, and a World Cup heading to the United States in 2031.
SoccerAssociation football — the most popular sport on Earth, played in every country under one set of laws and one world governing body.