The majority of the world calls what you call soccer, football. Our football prohibits players from using their hands in general play and therefor relying on their foot. In your football it is rare for you to use an actual foot for play, and it virtually never happens in open play.
Our football also predates your version of football, which in itself is a version of rugby, which was a spin off of our football.
Additionally our football is becoming more popular in North America. The MLS is going from strength to strength and will likely have more teams than the NFL in the coming years. In Canada our football has overtaken Canadian football in popularity.