The Roman Empire has one of the most enduring legacies of any civilization due to its ability to adapt to shifting circumstances. The emperor Trajan was famous for his aggressive expansion, extending Roman borders to their greatest extent. His successor Hadrian is famous for his wise decision to recognize the limits of Roman power and fortify the boundaries of the empire to a reasonable extent which the state could maintain. As Donald Trump explores both isolationist and expansionist options Alex Petkas, host of the "Cost of Glory" podcast, joins me to discuss what America can learn from these two great leaders.

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