Deadly Divide

How Insects, Pathogens, and People Defied the US-Mexico Border

Mary E. Mendoza

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Hardback

Forthcoming
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English

The University of North Carolina Press
28 April 2026

History of the Americas; Historical geography; Migration, immigration & emigration; Local history

When most people picture the US-Mexico border, they think of walls, fences, concrete, and wire. But in this first history of how the environment influenced physical boundary-making between the two nations, Mary E. Mendoza focuses on how the natural world shaped ideas about race, gender, and security. In so doing, she unearths surprising origins of the modern-day immigration debate.

Mexican migrants have historically been seen by some in the US as invasive and less than human. But actual invasive pests are part of this story. Deadly Divide shows how cattle ticks, the body louse, foot-and-mouth disease, and the female Mexican fruit fly contributed to the to the ever-increasing racialization of Mexican migrants, which in turn led to increased policing, criminalization, and fears about immigrants infiltrating the US. As Mendoza follows the stories of migrants in relation to various species, Indigenous peoples, and officials on both sides of the border, she argues that the need for mobility overpowered both governments’ laws, fences, and agents. At the same time, the border’s symbolic power became a source of terror not only for migrants who try to cross into the US but for those who feel they cannot cross back, making the US a nation that suspends immigrants between two worlds.

By: Mary E. Mendoza
Imprint: The University of North Carolina Press
Country of Publication: United States
Dimensions: Height: 235mm, Width: 25mm, Spine: 155mm
ISBN: 9781469695396
ISBN 10: 1469695391
Pages: 256
Publication Date: 28 April 2026
Audience: Professional and scholarly , Undergraduate
Format: Hardback
Publisher's Status: Forthcoming

Mary E. Mendoza is assistant professor of history at Penn State University and the editor of Not Just Green, Not Just White: Race, Justice, and Environmental History.

Reviews for Deadly Divide: How Insects, Pathogens, and People Defied the US-Mexico Border

""A brilliantly researched, clearly written book. Mendoza shows, in exquisite detail, the environmental, geopolitical, and social dimensions of the history of border-making."" —Virginia Scharff, University of New Mexico ""In adding the nonhuman to the history of the border, Mendoza makes one of the most important contributions that I have read in a while. This book will become part of the central set of books on the US-Mexico border."" —María E. Montoya, New York University