[jasonbvr]

South Carolina use to have their age limit set at 14 or 15. The reason was so that boys who worked on farms could drive the tractors legally on the road to and from the fields. Now though they have to stay in school until 16 so there was no point leaving the age that low and they changed it.

I am feeling that North Dakota may have a similar case, but you also have to think of how sparsely populated some midwestern states are. It makes a lot more sense to give a kid a driver's license so they get to school and get a job easier.