I'm drafting U.S. state/Model state page. When some of you have commented, I'll create pages for the 40-odd states that still don't have a page and I will use it to augment or vary the ones that do.
The same process can apply to other countries, with suitable amendments to that model.
Discussion of other countries
Discussion of U.S. model
(Note that a preliminary version of it can be viewed at Florida)