But how identity is mobilized makes an enormous difference—for the group’s odds of success, for the welfare of the people who join the movement, and for the country. Identity can be mobilized in ways that emphasize an overarching common humanity while making the case that some fellow human beings are denied dignity and rights because they belong to a particular group, or it can be mobilized in ways that amplify our ancient tribalism and bind people together in shared hatred of a group that serves as the unifying common enemy.

