Every bird that flies over a border does so without a passport. Every river that crosses one does so without permission. So why do humans — alone among all living things — build walls, draw lines, and die for the invisible?

This episode traces the full arc of one of humanity's most powerful and peculiar inventions — the nation-state. From the first walled settlements of ancient Mesopotamia, through the empires of Rome, the Islamic Caliphates, and the courts of Kautilya and Ibn Khaldun, to the Peace of Westphalia, the age of European colonialism, and the founding of the United Nations — Fault Lines asks where the idea of a country actually came from. And whether it was ever really real.

Along the way: why the nation and the state are not the same thing, what happened when European powers drew borders across Africa and the Middle East they had never walked, and what sovereignty actually means in a world too interconnected to be truly Westphalian.

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