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Urban Defenses is a city upgrade in Civilization VI. It is unlocked with Steel (or Civil Engineering, prior to the February 2017 Update).

Unlocking Urban Defenses builds modern fortifications in all cities (both existing and future ones) and their Encampment districts. This includes the ability to perform ranged strikes, as well as an advanced (but unnamed) form of Wall with 400 HP. It also makes them immune to the bonuses of Battering Rams and Siege Towers.

We could surmise that Urban Defenses consist of a combination of bunkers, trenches and barbed wire-style defensive perimeter which is much more effective against modern, machine-dominated warfare than a single wall.

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