A philosophical belief that all people are equally valuable citizens of the world and should care about the wellbeing of humans everywhere, not just in their own country.
From cosmopolitan plus -ism (a doctrine or system). The concept traces to ancient Stoic philosophers but gained prominence during the Enlightenment when thinkers rejected strict national loyalties.
Cosmopolitanism is both beautiful and controversial—imagine believing you're equally responsible for helping someone across the world as your next-door neighbor, which is exactly what cosmopolitans argue.
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