How much would property tax be on average for an acre of land in the United States?

Let’s say I wanted to buy an acre of land somewhere in the USA. I then build a small house. I put solar panels on the roof to sustain my energy needs, collected rain and dug a well to sustain my water needs, and planted a large garden and fruit bearing trees and bushes to sustain my food needs. I would just live off of the land.
I believe that my only expense would then be property tax. Or am I mistaken? If this is my only expense, what would be the average property tax that I would have to pay for just one acre? Yes, I know that it is different by state, but I’m just looking for an average or a ballpark because I have no idea what it would be. If this wouldn’t be my only expense, what am I missing? And what would that cost?