?The locust family, black and honey are "copsing" species, i.e, plant one tree and he roots will put up ssprouts eventually resullting in a grove or 'copse". The wood, Black Locust espeially makes great firewood and as noted, BL makes great 'never rot' posts, beams and thelike.
To kill one tree, cut it down, paint with glyphsophat and the patrol the area for several year with a spray bottle of gly. I cut one in my backyard and patrolled for about 3 years before I had it all. One sprout came up through a crack in the concrete INSIDE my 3 season porch 20 ft away from the stump.
I also planted 10 or 15 a thornless ?shademasster? honey locust. About 15 years later one of them had reverted to type with the long thorns, It died of chainsawitis the same day. I was getting flats on the garden tractor and trailers for 10 years later.