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As political and societal polarization deepens, democracies are under stress around the world. This article examines the complex relationship and causal direction between democracy and polarization and posits three theoretical possibilities: (1) polarization contributes to democratic backsliding and decay, (2) polarization results from democratic crisis, and (3) polarization contributes to democratic deepening. We argue “politics” is central to polarization and identify as a key feature of the process of polarization the manner in which it simplifies the normal complexity of politics and social relations. Polarization does so by aligning otherwise unrelated divisions, emasculating cross-cutting cleavages, and dividing society and politics into two separate, opposing, and unyielding blocks. As such, it often has pernicious consequences for democracy, emerging as an intended or unintended consequence of political interest–based and purposeful political mobilization. Polarization over the very concept of democracy may also be the product of democratic crisis. Finally, in certain circumstances, polarization may strengthen democratic institutions and citizen choice. The article then introduces the articles in this issue that address these three theoretical and empirical possibilities. [ABSTRACT FROM AUTHOR]

This article argues that a common pattern and set of dynamics characterizes severe political and societal polarization in different contexts around the world, with pernicious consequences for democracy. Moving beyond the conventional conceptualization of polarization as ideological distance between political parties and candidates, we offer a conceptualization of polarization highlighting its inherently relational nature and its instrumental political use. Polarization is a process whereby the normal multiplicity of differences in a society increasingly align along a single dimension and people increasingly perceive and describe politics and society in terms of “Us” versus “Them.” The politics and discourse of opposition and the social–psychological intergroup conflict dynamics produced by this alignment are a main source of the risks polarization generates for democracy, although we recognize that it can also produce opportunities for democracy. We argue that contemporary examples of polarization follow a frequent pattern whereby polarization is activated when major groups in society mobilize politically to achieve fundamental changes in structures, institutions, and power relations. Hence, newly constructed cleavages are appearing that underlie polarization and are not easily measured with the conventional Left–Right ideological scale. We identify three possible negative outcomes for democracy—“gridlock and careening,” “democratic erosion or collapse under new elites and dominant groups,” and “democratic erosion or collapse with old elites and dominant groups,” and one possible positive outcome—“reformed democracy.” Drawing on literature in psychology and political science, the article posits a set of causal mechanisms linking polarization to harm to democracy and illustrates the common patterns and pernicious consequences for democracy in four country cases: varying warning signs of democratic erosion in Hungary and the United States, and growing authoritarianism in Turkey and Venezuela. [ABSTRACT FROM AUTHOR]