»Soziale Basis politischer Konfliktlinien in der Weimarer Republik, 1919-1933«. This article focuses on the divided and scattered political affiliations in the Weimar Republic which helped to provide an environment that supported rapid political changes between 1919 and 1933. Using methodologies of historical electoral research, this article considers cleavages between party blocs on a federal level by analyzing the stability within and voter fluctuation between political parties. These voter fluctuations are also analyzed by considering the social background of the eligible voters, as well as by religious denomination. An ecological regression analysis and aggregate data analysis determine the stability of voter blocs and note a number of reasons why the NSDAP received such a large number of votes from a rather stable voting system in March of 1933.