The human mind evolved for living in tribes that engaged in frequent (and often violent) conflict; our modern-day minds readily divide the world into “us” and “them,” even on trivial or arbitrary criteria, as Henri Tajfel’s psychological experiments demonstrated. Identity politics takes many forms. Some forms, such as that practiced by Martin Luther King, Jr., and Pauli Murray, can be called common-humanity identity politics, because its practitioners humanize their opponents and appeal to their humanity while also applying political pressure in other ways. Common-enemy identity politics, on
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