This article offers a comparative analysis of the origins and development of autonomism in interwar Alsace and the Moselle. Upon the liberation of the provinces in November 1918, the local populations of Alsace and the Moselle enthusiastically welcomed French troops. For President Raymond Poincare´ this enthusiasm constituted a clear ‘plebiscite’. But, in light of perceived heavy-handedness on the part of the new French rulers, this enthusiasm proved short-lived and rapidly gave way to a widespread malaise. In response to local fears for the preservation of their distinctive social, linguistic and religious traditions, Autonomist organisations emerged to oppose the loss of what they perceived to be the soul and character of Alsace and the Moselle. They rapidly became a pervasive force in local politics, cutting across ideological and class barriers and dividing parties. For the French government, autonomism represented a serious threat to national unity. For local autonomists, however, it represented an attempt to preserve local socio-economic structures and linguistic and cultural practices. The discussion here seeks to reposition autonomism within the context of local politics and to compare the distinct experiences of Alsace and the Moselle in the decade after their return to French rule. [ABSTRACT FROM PUBLISHER]