Sounds like all of those things helped you to get into madison. It is not *just* because you are a wisconsin resident, but do bear in mind that that does make a tremendous difference. That article in the sources listed below gives a ceiling of 25% can be at most out-of-state students, but looking at trends, about 77% or so seem to be in-state students. Being in-state always helps, but it was not the only reason you were accepted so do not worry.

It seems like the rest of your application made up for your poor ACT score (your GPA is fine), so if it worked at Wisconsin, it might work for UNC (but in that arena you are in the limited out-of-state competition, so I am reluctant given your ACT score being sufficiently distracting).