Q.Eastern Redbud Started Showing Signs Of Budding Then Turned Black. Last Year Another Redbud Did The Same Thing But Got Suckers At
bottom of trunk later in the season Had a nursery plant this tree.

Certified GKH Gardening Expert
This could be a sign that the tree was overwatered as it was being established, and has contracted a disease. It will be hard to say from this photo, but you may have some luck with a fungicide of your choice. Make sure to prune off any dead growth that snaps and does not bend.
Here are some articles that will help:
https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm