The name of the category would also have to be changed from Regional Boards to State Boards.
In theory, this sounds like a nice idea. Although it would create a super long list on the forum index with a single category listing all 50 states. Yeah, you can have 100 threads per page within a forum by default and up to 50 messages per page within a thread–I currently have the defaults of 100 and 25, respectively, but I'll probably end up changing the latter to 50–which you can change in your options to show more or less, but there's no such option for the forum index.
Alternatively, each region could be changed from a forum to a category and then have each state as a forum within those categories. You could also simplify the regions and just have Western States, Central States, and Eastern States.
But putting all that aside, it would be such as massive task because there would be a lot of moving of threads involved, especially if we make each of the 50 states a forum, as whoever would have to go through each thread and figure out where it belongs. A lot of titles make it clear, but not always. And then sometimes you have a thread that involves two or more states. For example, my Interstate 82 thread is about the route in both Washington and Oregon, so if we were to have forums for each state, where would a thread like that go? Completely outside of all that and just in General Highway Talk?
That's why I'm saying that it's a good idea in theory, but in practice, I'm not so sure.