How Did the Roman Empire Expand so Efficiently?

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Sources:

Beard, Mary., North, John., Price, Simon. Religions of Rome: Volume 1, A History (United Kingdom: Cambridge University Press, 1998).

Bunson, Matthew. Encyclopedia of the Roman Empire (United States: Facts on File, 2008).

Cowan, Ross. Roman Legionary 58 BC–AD 69 (United Kingdom: Bloomsbury USA, 2003).

Duncan-Jones, Richard. Structure and Scale in the Roman Economy (United Kingdom: Cambridge University Press, 2002).

Keppie, Lawrence. The Making of the Roman Army: From Republic to Empire (United Kingdom: Routledge, 1998).

Lintott, Andrew. Imperium Romanum: Politics and Administration (United Kingdom: Taylor & Francis, 2013).

Sekunda, Nick., Northwood, Simon., Hook, Richard. Early Roman Armies (United Kingdom: Bloomsbury USA, 1995).

Armchair Team Credits:
https://docs.google.com/document/d/1sYjrtdKP67bvEH4UWOv-24_dwJGxZ395ZuczyKOUFNw/edit?usp=sharing