Bears are in the norther LP and in the UP. The wolves were gone from Michigan for a while and were not reintroduced, but rather returned on their own. I believe they are also in Northern LP and the UP. Eastern cougars that once were a common predator in the Appalachian Mountains were recently labeled extinct after long speculation that they had been. There is a movement to reintroduce western cougars where eastern cougars once roamed in order to give animals such as deer natural predators.
We all know the story of wolverines to add to what I've said above.
The problem with these predators is that their populations are spread so thin because people don't want them where they live, so there is a lot of backlash against reintroduction or allowing them to spread. What isn't understood is that our 3 weeks or whatever of deer hunting doesn't properly solve the natural cycle that nature has deemed necessary. There needs to be predators, and there needs to be more, and not just humans.