A license plate on your car was originally intended to serve a single function: To show that you had paid a road-use tax for that vehicle. As time has gone by, that purpose has gradually expanded and now the little placards are used as a sort of bar code, identifying your vehicle (and theoretically its occupant) for various .gov observers.
The states in which I've resided as an adult (Georgia, Tennessee, and Indiana) are all relatively "free" states. They share liberal gun laws, 70 MPH speed limits (which means a de facto 80) on the interstates, low income taxes (or no income tax, in the case of TN), and are not generally known for nanny-state legislative climates. As I was tooling southbound on I-75, I couldn't help but noticing something odd. All the Ohio and Illinois cars had a feature that was foreign to me: They had license plates on the front of their vehicles.
I decided to look into it.
It appears the correlation is far from perfect, because there are some fine and free states (AK, MT, NH, TX, WY) that want to brand your car like a steer, and for some reason that California of the South, N. Carolina, hasn't gotten around to handing out a front license plate, but there is definitely a moderately accurate relationship between front license plates and places I would not want to live...