By the way rommie, thanks for pointing out that the British came up with this whack-as$ system by saying "imperial" and not "American". (although we Americans are apparently too stupid to get rid of it...) hehe.
Sorry, dude. Imperial measurements existed before America did. (Or at least, before the native Americans got invaded by Europeans, who then called themselves American). America inherited, not invented, the imperial system. The rest of the world then (mostly) stopped using it.