Astonishingly, I hear there exist problems with the
communities that can be solved by means *other* than duplicating the
American constitution in microcosm. Heretical thoughts, I know, but
there you are.
American's do seem to have a habit of thinking that clear separation
of powers is a necessary part of any fair government... the UK manages
fine without any such system. (For example, the Attorney General is a
cabinet minister (ie. lawmaker) with the power over criminal
prosecutions (judicial).) I think the main reason the US needs the
separation of power is because of the enormous power held by
individuals. In the UK, there is almost always at least some degree of
parliamentary oversight. I think Wikipedia is closer to the UK system
- no individual can just do whatever they like, they always need the
support of the community.