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.