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Inequality of any kind, once considered a normal, natural part of human existence, came to be seen in the course of the twentieth century as increasingly illegitimate.

Michael Mandelbaum (2009). “The Case for Goliath: How America Acts As the World's Government in the Twenty-First Century”, p.9, PublicAffairs
Inequality of any kind, once considered a normal, natural part of human existence, came to be seen in the course of the twentieth century as increasingly illegitimate.