"La Survivance" is the period beginning after the defeat of the Patriotes in the rebellions of 1837-1838 and lasting until the Quiet Revolution. It concerns the survival strategies employment by the French-Canadian nation and the ultramontane of the Catholic Church following the enactment of the Act of Union of 1840 which established a system whose goal was to force the cultural and linguistic assimilation of French Canadians into British culture. In addition to the revenge of the cradle, a phlegmatic character was adopted in the face of the mass importation of British immigrants. Some French Canadians left Quebec during this period in search of job security and protection of their culture. This phenomenon, better known under the name of “Grande Hémorragie”, is the origin of the Quebec diaspora in New England and Northeastern Ontario among other places. It led to the creation of permanent resistance movements in those new locations. Groups of nationalists outside Quebec have since then promoted Quebec's cultural identity, along with that of the Acadians in the Maritime provinces and in Louisiana, represented by the Société nationale de l'Acadie since 1881. Louis-Alexandre Taschereau coming to power in 1920 created an upheaval in French-Canadian society for most of the interwar period. The confrontations and divergence of political opinions led to the rise of a new form of nationalism, called clerico-nationalism, promoted by Maurice Duplessis and the Union Nationale party during the Grande Noirceur of 1944 to 1959.