The leaves and bark look like Robinia.
There are several species but R. pseudoacacia, AKA black locust, is the one I know down here, esp in hotter, drier areas. It can sucker profusely and some old, abandoned rural house sites have become a dense mass of stems.
I've seen some people try to use these as bonsai but they don't seem to ramify well so I would not bother, esp if you have to start from seed. Compound leaves are also large and difficult to reduce.
So many better plants to work with