Our guest Steele Brand offers an original answer to this question in his new book Killing for the Republic: Citizen Soldiers and the Roman Way of War. Brand is professor of history at The King's College in New York City. His understanding of military matters is informed by his service in the US army as a tactical intelligence officer including a combat tour in Afghanistan.
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Scholarly works mentioned during the conversation:
Arthur Eckstein, Mediterranean Anarchy, Interstate War, and the Rise of Rome, University of California Press, 2007. (discussed at the 33:55 mark)
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The intro to this episode was provided by Genn McMenemy and Jenny Williamson of the Ancient History Fangirl podcast, a show that offers wildly entertaining and well-researched journeys through the ancient world. Check it out at ancienthistoryfangirl.com