that this pragmatic principle dictated the slaughter of the native american, the enslavement of the black and the monumental rape of africa no one will now attempt to deny

윗 문장에서 that절이 주어역활 하는것같은데 no one은 어떻게봐야하나요?

ancient maps of the world inform us, concerning that void where america was waiting to be discovered, here be dragons.

윗문장에서 형용사인 void가 왜 저자리에 왔는지, 그리고 어떻게 해석해야할지 질문드립니다.