User blog comment:UnofficialGameExpert78/Age of Empires II HD: The American Tribes/@comment-2A02:120B:C3D1:D140:986B:9AB3:E610:F882-20181025111448/@comment-30831233-20181025121531

Why would MS need permission to add a civilization? They didn't travel to Guatemala and ask the Mayan descendants if they wanted to be included. If they want to add them, just add them.