France did expand into Africa. France is both the centre of the European Community (essentially the pre-Maastricht EEC) and of the French Commercial Union. Large parts of Africa came under French domination and eventually each African territory became a department.
However, a department is a relatively small body, equivalent to a county. In the old African colonies, departments were created for French citizens living in the African colonies. Hence these departments had massively more people than metropolitan departments, but only the fraction of the population who were citizens could vote. Colonial subjects could become citizens by
assimilation. Thus the French African colonies had two legal classes; citizens (both settlers and assimilated natives) and associates (i.e. non-citizen natives).