I wasn't aware that any state licensed or certified historians. It's accademic credentials that are the key here, and there are many non-state universities granting them. In fact the two schools in question here, Emory and Columbia are both non-state schools, AFAIK. As are many of the hotbeds of academic political correctness and liberalism.
Plus Cramer is not without some credentials himself, having a Master's in History, just not the vaunted Piled Higher and Deeper (PhD) degree. He also is a widely published author, in both law reviews and historical journals.