I've driven in many states, and IMO the state doesn't matter (north/south etc), but the metro size. The bigger the city -- the worse people drive. E.g. Chicago is pretty bad, being north.
No. Boston drivers are just about the worst I’ve seen. Worse than LA. Worse than any southern city. Boston isn’t small but it isn’t LA but it’s far worse.
Dallas is worse, depending on how you define "aggressive." (i live ~2 hours from NOLA and ~5 away from Dallas.) During rush hour i traffic break and Dallas and Vegas have the highest ratio of people that will do the "cut you off then brake because there's only 100' of runway, there". NOLA feels like inept drivers (oblivious is how i describe many Louisiana drivers, in general!)
I was living in Vicksburg as a kid, so the three big cities we would visit were Memphis to the north, New Orleans to the south, and Dallas to the west (skip Shreveport). And…I have no memories about crazy drivers cutting lanes like they didn’t exist in Dallas or Memphis.