Jean-Paul Sartre's existentialism might be understood as the cradle of his conceptual analysis of not only human reality and morality, but also the individual and society. The historical base of his philosophy is not unrelated to events such as: the humiliating defeat which Paris suffered at the hands of the German Army an event which was punctuated by the German Occupation, and Sartre himself was imprisoned by the Germans and set free only because of his continually failing eyesight.
Mashaka C. P. Oniang'o (1975) studied this question.