Football is one hell of a sport, and was founded on the fundamentals of soccer and rugby, calling it 'American rugby' is just stupid. There are a lot of things in this world that share names, so unless you complain about all of those too, you should just get over it and accept the name we gave it.
OT:
I'd change just about everything about America, especially about the education system. I'd probably tinker with the legal system as well, but only a little.
It's down right embarrassing when kids in America graduate high school and don't know how to read or even be able to tell time on anything short of a digital clock.
Those kids should either be forced to learn simple shit, or they should be put down and fed to the local wildlife.
*shrug*