translation: The Founding Fathers rejected that idea, and they replaced it with a new anatomical concept, and that concept was "all men are created equal." They leveled that playing field and decided the anatomy that mattered was the commonality of anatomy, not the difference in anatomy, and that was a really radical thing to do.
translation: Ellos nivelaron el campo de juego y decidieron que la anatomía que importaba era la anatomía en común y no las diferencias anatómicas. Eso fue algo muy radical.