The creation of Modern France through expansion goes back to the establishment of a small kingdom in the area around Paris in the late tenth century and was not completed until the incorporation of Nice and Savoy in 1860. The existing "hexagon" was the result of a long series of wars and conquests involving the triumph of French language and culture over what once were autonomous and culturally distinctive communities. The assimilation of Gascons, Savoyards, Occitans, Basques, and others helped to sustain the myth that French overseas expansionism in the nineteenth century, especially to North and West Africa, was a continuation of the same assimilationist project.
National Identity in France and the United States (2003)