The Extended Republic

Madison’s most original contribution to political thought, developed in Federalist No. 10, inverted the received wisdom of his era. Classical republican theory held that popular government could only survive in small territories where citizens knew each other and shared common values. Madison argued the opposite: a large republic was safer precisely because its scale and diversity made it nearly impossible for a single faction to capture the whole. “Extend the sphere,” he wrote, “and you take in a greater variety of parties and interests; you make it less probable that a majority of the whole will have a common motive to invade the rights of other citizens.” Distance, diversity, and the sheer difficulty of coordinating inflamed passions across a vast and varied population were the friction that kept faction from going critical. The argument depended on a physical fact: that it was hard for an emotion to propagate across a continent.