It seems to me that whoever called American football "football" was a moron. Wasn't the name already taken? Why do Americans call it soccer and everyone else calls it what it is: football?
Hello. Firstly, tone down your language: this sub is not the place for slinging insults.
On to the terms "football" and "soccer", you'll find a good overview in this post:
You may also be interested in the map in this post from /u/mapporn, "Football" vs "Soccer": How people of the world name the beautiful game.[OC][5,000px × 2,543px].