While assuming that many slaves did approximate the character of "Sambo," Elkins absolutely rejects any racial or cultural explanation. Modern African studies have not led to any evidence of a "Sambo" type in Africa. Similarly, the literature of South America does not contain any figure comparable to him. Apparently, "Sambo" was not merely the result of slavery, but he was the result of the unique form of slavery which developed in North America. Unrestricted in his powers by institutions such as the crown and the Church, the American slave master had gained total control of his slave property. In a desire to maximize the profits of his investment, he strove to develop the perfect slave. Although the slave might endeavor to conform externally while maintaining his inner integrity, eventually his performance as an ideal slave must have affected the shape of his personality. Modern existentialism has argued that how we behave determines what we are, and it is in this sense that the controlled behavior in the concentration camp and its impact on personality formation provide an illuminating parallel to the study of American slavery. The experienced gained in the German concentration camps during the Second World War showed that it was possible to induce widespread infantile behavior in masses of adults. Childlike action extended beyond obedience to the guards and showed that a basic character transformation had occurred. Previous social-psychological theory stressed the ways in which an individual's personality was shaped during his earliest childhood years and emphasized the tenacity with which these early traits resisted attempt at alteration. Personality theory was not adequate to what occurred in the camps. The concentration camp experience began with what has become labeled as shock procurement. As terror was one of the many tools of the system, surprise late-night arrests were the favorite technique. Camp inmates generally agreed that the train ride to the camp was the point at which they experienced the first brutal torture. Herded together into cattle cars, without adequate space, ventilation, or sanitary conditions, they had to endure the horrible crowding and the harassment of the guards. When they reached the camp, they had to stand naked in line and undergo a detailed examination by the camp physician. Then, each was given a tag and a number. These two events were calculated to strip away one's identity and to reduce the individual to an item within an impersonal system.