since the entire idea is based on we are not cut out to be a single nation.
Over two centuries of history begs to differ with you. If we weren't meant to be a single nation and our differences were as great as you think, the whole thing would have fallen apart long ago.
This division should appeal to all sides.
Maybe we haven't split because there isn't as much division among the population as you seem to think. Just because you, personally, hate the idea of the US doesn't mean anyone else does.