 In 1983, Jeanne Henriette Louis defended his thesis on psychological warfare in the United States during World War II, entitled "Les concepts de guerre psychologique aux États-Unis de 1939 à 1943, l’engrenage de la violence" ("The concepts of psychological warfare in the United States from 1939 to 1943, the cycle of violence").It is therefore convinced that research on colonial America have forgotten important elements, and postdoctoral work focuses on the seventeenth and eighteenth centuries in North America.Jeanne Henriette Louis says that comparisons between the French colonization of the Americas (French colonial) and the British colonization of the Americas (British colonial America) have rarely been conducted, this field of investigation is rich and promising.