All the easy ways to prevent people from voting got outlawed in the Civil Rights era, but they're trying to bring them back. Requiring photo identifications at polling places is the current push, since people who don't have a car don't need photo ids and those people tend to be poor and Democrat. They've just passed that law in a few states already, mine included. There hasn't been time for a court challenge yet.

If they succeed with that one, the next historical barrier to bring back will be "literacy tests".