Socialized with "old cleavages" or "new dimensions": An Age-Period-Cohort analysis on electoral support in Western European multiparty systems (1949–2021)

Across Western Europe, the electoral base of formerly dominating parties on the left and the right has been eroding in the past decades. In contrast, both far-right parties and green parties could expand their vote share in numerous elections all over Western Europe - especially among younger voters. Still, those transformations in multiparty systems remain understudied: Are those electoral differences representing a cohort effect within the left and within the right bloc? This study uses survey data from ten Western European countries spanning over 60 years to test for cohort differences in political blocs. By applying multilevel logistic regression models and generalized additive mixed models, the analysis yields generational differences within the left and the right, with more recent cohorts being more likely to vote for greens than other left-wing and more likely to prefer the far-right over other right-wing parties. Those results shed light on the cohort-driven electoral realignment in Western Europe.