Where in Ontario (a very large and diverse province, from Hudson Bay to Lake Erie)?
What if you were to prune/collect some examples of these hairy thorny stems, and lay them in a position (countertop, driveway, sidewalk, or the like) where you could take clear closeup images of the stems, buds, hairs, thorns, etc.?
That would go a long way toward helping ID these plants. You could do the same with some of the "normal" branches, showing the dormant twigs/branches/buds clearly.
There are Robinia sp. native to North America with bristly young stems and thorns at leaf nodes - Robinia hispida is one. Compare your plants with that. Robinia sp. are also notorious colonizers, meaning that they freely sprout new stems from their root systems.