When an Urban Layout Unified the World: From Tenochtitlan to the City of Mexico—The Emergence of a New Urban Model in the Early Modern Era

This paper investigates the complex interplay between European and pre-Hispanic urban traditions in shaping colonial urbanism across the Americas, with particular emphasis on the transformation of the City of Mexico atop the remnants of the ancient city of Mexico-Tenochtitlan. It contends that the development of the viceregal capital was not merely a straightforward transplantation of the Castilian urban model, but rather a process profoundly influenced—and in many respects enabled—by the sophisticated spatial organisation of the Mexica metropolis. The research examines how the foundational urban layout of Mexico-Tenochtitlan informed the design of the colonial city, highlighting both continuities and divergences between indigenous and Castilian urban frameworks, and analysing the fusion of these traditions in the formation of a novel urban entity. Employing a historical-analytical methodology, this article combines documentary research, comparative analysis of urban configurations from both cultures, and case studies of early colonial settlements. The findings suggest that the City of Mexico evolved into a paradigm of hybrid urbanism, wherein European planning doctrines were adapted and interwoven with enduring indigenous spatial logics and symbolic systems—a synthesis that not only characterised the viceregal capital but also established a precedent for urban development throughout Spanish America.