It's All a British Problem
The British are getting more and more insistent that here in the U.S. we use the word "football" to refer to soccer. Actually, the confusion over these words goes back to 1823 when, at a football match (that was our soccer) a student in the town of Rugby decided to pick up the ball and run with it. That one act created a running a tackling version of the game we now call rugby. In the use, we gradually changed some of the rules and added lots of padding. All three sports originate from this 1823 revolution, This leads us to the SF Bay area this coming week-end when teams from around the world will play a world championship of not soccer, and not American football, but real rugby as invented in the town of Rugby.