Reconstructing the events of July 12 in those years, Gordon provides a riveting and richly detailed account of the riots. He maintains that they stemmed from more than religious hatred or generations of oppression in Ireland. Rather, both years bear witness to a struggle between two profoundly different visions of the promise of America: a re-creation of European social classes or a form of life liberated from the constraints and stratifications of the Old World. These visions were enmeshed n the turbulent ideological and political confrontations arising from industrialization and newly found immigrant power under New York City's notorious mayor, William Marcy "Boss" Tweed. Gordon concludes by showing how the riots sparked a reform movement that toppled Tweed from power and led to the restructuring of city politics in the 1870s.