This phenomenon happens most often west of the Mississippi River in what we know as the High Plains and West, but it's not limited to there. The Upper Midwest seems to also have a thriving tribal ecology focus, and even the Eastern Cherokee, a little birdie whispered in my ear, are starting to take their tribal areas in Western North Carolina more seriously in terms of holistic management. There might be some elk running around soon.
Here is an informal list of what I have found so far. If you want to learn more about any specific introduction effort, I would use the tribe and species as keywords for an internet search and I bet you find something:
Note: I am trying to collect a list of reintroduction, but there are plenty more programs where there are habitat improvements for endangered, or locally extinct species that might not make the list. My scope might be too narrow, but I started a while ago when it seemed a fun challenge and this list would get really long if I listed every habitat improvement program, as much as I applaud them.
