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Ideology is a recurrent feature of human societies. Ideologies provide people with frameworks to evaluate the relative legitimacy of different approaches to social order. Such ideologies often involve an opposition between right-leaning ideologies, which tend to justify and maintain the traditional order, and left- leaning ideologies, which advocate for systemic reforms to reduce hierarchies. Social psychological investigations of ideology explore the root motivations and moral foundations of people’s attraction to left versus right ideologies.