Mark Peterson's The City-State of Boston is a formidable work of history—prodigiously researched, lucidly written, immense in scope, and yet scrupulously detailed. A meticulous history of New England over more than two centuries, the book argues that Boston and its hinterland emerged as a city-state, a “self-governing republic” that was committed first and foremost to its own regional autonomy (p. 6). Rather than as a British colonial outpost or the birthplace of the American Revolution—the site of a nationalist struggle for independence—the book recovers Boston's long-lost tradition as a “polity in its own right,” a fervently independent hub of Atlantic trade whose true identity placed it in tension with the overtures of both the British Empire and, later, the American nation-state (p. 631).