OP, after reading this and your other threads, you seem to be having difficulty figuring out where to apply ED. You’ve mentioned Michigan, UVA, Williams, and now Northwestern. Have you visited all of these schools? Really looked at their programs and identified which suits your interests best? Or are you just looking for a name? I suspect it’s the latter.
You have less than a month until ED applications are due. If you don’t have a clear first choice school, you probably shouldn’t be applying ED. Each school has essays that ask why you want to attend that school. Sounds like you don’t really have this figured out.