One of the main systemic effects of détente in Europe was the political crisis of the centre parties of Christian-democratic inspiration that had built their own centrality in the government of Continental Europe just on the basis of the ideological hegemony of the democratic anticommunism. It should indeed be noted that the dialogue between the blocks led to a reduction of the prominence of Western Europe in the geo-political schemes and destabilized the European Christian Democrats, whose identity was firmly built on the doctrine of the indissolubility between Europeanism and Atlanticism. The paper aims at highlighting the political consequences unleashed by the détente in the main national areas where Christian democratic parties have ac...