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Studies on party system change in Latin America commonly label similar processes as constituting dealignment or realignment. To clarify the boundaries between both concepts, we distinguish between abrupt and gradual realignments. While both imply change, they differ in the number of election cycles involved. Abrupt realignments occur in a single election cycle, while gradual realignments take place in two or more. We apply this conceptualisation to Costa Rica, Latin America’s longest-running democracy, and a country where the party system has decayed without collapsing. To better identify the type of change that has taken place, we use canton-level election data from 1958 to 2018 and public opinion surveys from 1978 to 2018. The evidence contests the notion of electoral dealignment. Instead, we show that the party system experienced an abrupt realignment in the 2002 election and gradual realignment in more recent election cycles.

Studies on party system collapse or individual-party breakdowns view programmatic inconsistency or convergence as necessary for abrupt party system change. In theory, a new or fringe contender can suddenly emerge and disrupt the party system under such circumstances. We test that claim by examining Nayib Bukele’s 2019 presidential election victory in El Salvador. With data from the AmericasBarometer, we estimate probit models and predictive margins to examine the individual-level determinants of disruption in an institutionalised and ideologically polarised party system. The empirical results reveal that Bukele won amid salient ideological differences between traditional parties and that critical views towards democracy fueled his core support. Therefore, we conclude that a significant disruption in an institutionalised party system can occur notwithstanding robust ideological differences between leading contenders. Critical attitudes towards democracy can represent a driving force behind a party system’s disruption.

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