People ask how we could have lived on a world with a major indigenous civilization in the middle of multiple major wars and never realized it. The answer is simple. We settled the coastal regions and did not enter the jungles in large numbers. Their largest and most powerful civilizations were in the deepest parts of the rainforests or jungles and they didn’t go to the coasts. There was water there, and everybody knows that no self-respecting cat wants to be anywhere near water if they can help it. Also, they weren’t exactly an industrial society. There were no train tracks or factory plumes for us to detect while flying overhead. They weren’t noble savages or anything like that, though. They had complex societies complete with large cities, small villages, several major religions, numerous international borders, and large standing armies. They’re actually more like us than the Peloran or Arnam. There’s a reason for that.