The course is organized around the three pillars of the Harney Collaborative Specialization: ethnicity (and other predicates of groupness), immigration, and pluralism. Academic and political debates around each of these topics are marked by antinomies: Are ethnicity, race, and nationhood substantive categories, deeply rooted in culture, or are they constructed either through the choices of individuals or the machinations of interest-seeking elites? Is immigration a specific mode of human migration, premised on the organization of the world into a system of nation-states, or one of many kinds of human mobility that should not be privileged? Is the quest for pluralism a step toward greater justice, especially for historically oppressed groups, or a ruse meant to reinforce already existing differentials in power? The course is divided into three parts, each addressing these and related questions. Part I explores ethnicity, gender/sexuality, race, and nationhood; Part II focuses on immigration/mobility and citizenship in the industrialized democracies and Global South; Part III turns to debates around pluralism, including arguments for and against multiculturalism.