Archaeology without Borders presents new research by leading U.S. and Mexican scholars and explores the impacts on archaeology of the border between the United States and Mexico. Including data previously not readily available to English-speaking readers, the twenty-four essays discuss early agricultural adaptations in the region and groundbreaking archaeological research on social identity and cultural landscapes, as well as economic and social interactions within the area now encompassed by northern Mexico and the U.S. Southwest. Contributors examining early agriculture offer models for understanding the transition to agriculture, explore relationships between the spread of agriculture and Uto-Aztecan migrations, and present data from Arizona, New Mexico, and Chihuahua. Contributors focusing on social identity discuss migration, enculturation, social boundaries, and ethnic identities. They draw on case studies that include diverse artifact classes - rock art, lithics, architecture, murals, ceramics, cordage, sandals, baskets, faunal remains, and oral histories. Mexican scholars present data from Chihuahua, Durango, Zacatecas, Michoacan, Coahuila, and Nuevo Leon. They address topics including Spanish-indigenous conflicts, archaeological history, cultural landscapes, and interactions among Mesoamerica, northern Mexico, and the U.S. Southwest.