This book presents a discussion of the culture history of ancient West Mexico from the time of the first human inhabitants until the last cultural developments that took place before the Spanish invasion in the 16th century. The overall narrative is played out within the context of the Mesoamerican ecumene; that is, the universe of cultural and social interactions that coalesced into one of the few pristine civilizations of the ancient world.

The book presents a long-overdue synthesis and update of West Mexican archaeology aimed at scholars, students and the general public. Ancient West Mexico in the Mesoamerican Ecumene is the first book about West Mexican archaeology written by a single author. Another unique feature of this book is that it follows a holistic approach that includes data and perspectives from sociocultural anthropology, ethnohistory, ethnoarchaeology, and general analogy with many ancient cultures within the Mesoamerican ecumene and beyond (including several of the Old World). The focus of interest is the relationship between West Mexico and the rest of the ecumene, and the role played by the ancient West Mexicans in shaping the culture and history of the Mesoamerican universe.

Ancient West Mexico has often been portrayed as a 'marginal' or 'underdeveloped' area of Mesoamerica. This book shows that the opposite is true. Indeed, Williams convincingly demonstrates that West Mexico actually played a critical role in the cultural and historical development of the Mesoamerican ecumene.