Prickly Ash Tree
Zanthoxylum americanum or Zanthoxylum lave-herculis
I am not sure which of these I have, but I lean toward lave-herculis because of the pointed leaves.
The trees on my land are attractive small trees whose bark is covered with small spines that hurt if you grasp a branch or truck. It is the most common tree on the east, sandiest part of the land. In addition to the prickly bark, these trees have leave that tingle on the tongue when you chew them. One name for this tree is "toothache plant."
It is said to be useful to treat tooth and gum disease and as a poultice for sore muscles. I have never tried it. The tree is also used as a home by birds. They are pretty trees, most of which I will keep.