To a degree, lots of us take our lead from the laws of the US. We always evaluate your significant changes - some we reject and some we use but hopefully we put our own slant on it.
The question that I have as an outsider is 'would the US constitution be a model for world government?'
Ie all countries or districts would be 'states' with a single central government.
It would be quite nice if we could say that it could. And it is probably true that the US constitutional framework is a 'start' in this direction.
I could see NZ or Australia becoming states in the long term future. We are wary of constitutions as we do not think they are flexible enough - but we could get over that. NZ would probably not join the Union until you guys sorted out your health issues which we find barbaric (sorry but we do).
We would either have to abandon the royalty (which is more than possible in the next decade or two) or we would have to make some provision for royalty to remain as figureheads in some way or other.
The question becomes more interesting for countries which do not speak English. And I guess it would stretch things to include countries which do not have a Judeo -Christian tradition - not so much because of religion, but more to do with people's traditional attitudes to life and liberty.
But if world government is possible, then having semi independent local government (ie the equivalent of US states), a constitution and an overall government (ie equivalent to the federal govt) is a good model.
They say the biggest effect on the way that countries will set themselves up will be how the internet changes things. And certainly Face Book has changed the world forever.
So you guys - get your act together - and we will all come along with you and have world peace and prosperity for ever.