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Deadly Divide: How Insects, Pathogens, and People Defied the US-Mexico Border
256 pages, Paperback
Published April 28, 2026
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August 19, 2026
A Brilliant Environmental History That Rewrites the Story of the US-Mexico Border
When most of us picture the US-Mexico border, we imagine walls, fences, concrete, and wire. Mary E. Mendoza asks us to look again not at the built environment, but at the natural world that has shaped ideas about race, gender, and security for over a century. Deadly Divide is a stunning work of environmental history that unearths the surprising origins of the modern-day immigration debate.
Mendoza's central argument is both elegant and devastating: actual invasive pests cattle ticks, the body louse, foot-and-mouth disease, and the female Mexican fruit fly have historically been linked in the American imagination to Mexican migrants themselves. Both were seen as invasive, dangerous, and in need of containment. This conflation of human beings with biological threats contributed directly to the ever-increasing racialization of Mexican migrants, which in turn led to heightened policing, criminalization, and fears of infiltration.
But the book is not simply about American fears. Mendoza follows the stories of migrants, Indigenous peoples, and officials on both sides of the border, revealing a far more complex reality. She shows that the need for mobility of people, of goods, of animals repeatedly overpowered the laws, fences, and agents of both governments. The border was never as impermeable as its architects hoped, and nature itself repeatedly defied human attempts at control.
What makes this book extraordinary is its compassion. Mendoza does not reduce migrants to victims or officials to villains. She shows us a world where the border's symbolic power becomes a source of terror not only for those who try to cross into the US but for those who feel they cannot cross back a suspension between two worlds that has profound human consequences.
Deadly Divide is essential reading for anyone seeking to understand the tangled histories of environment, race, and nation at the US-Mexico border. It is a work of rigorous scholarship and deep humanity and a timely reminder that the natural world has always been part of the story we tell about who belongs and who does not.
When most of us picture the US-Mexico border, we imagine walls, fences, concrete, and wire. Mary E. Mendoza asks us to look again not at the built environment, but at the natural world that has shaped ideas about race, gender, and security for over a century. Deadly Divide is a stunning work of environmental history that unearths the surprising origins of the modern-day immigration debate.
Mendoza's central argument is both elegant and devastating: actual invasive pests cattle ticks, the body louse, foot-and-mouth disease, and the female Mexican fruit fly have historically been linked in the American imagination to Mexican migrants themselves. Both were seen as invasive, dangerous, and in need of containment. This conflation of human beings with biological threats contributed directly to the ever-increasing racialization of Mexican migrants, which in turn led to heightened policing, criminalization, and fears of infiltration.
But the book is not simply about American fears. Mendoza follows the stories of migrants, Indigenous peoples, and officials on both sides of the border, revealing a far more complex reality. She shows that the need for mobility of people, of goods, of animals repeatedly overpowered the laws, fences, and agents of both governments. The border was never as impermeable as its architects hoped, and nature itself repeatedly defied human attempts at control.
What makes this book extraordinary is its compassion. Mendoza does not reduce migrants to victims or officials to villains. She shows us a world where the border's symbolic power becomes a source of terror not only for those who try to cross into the US but for those who feel they cannot cross back a suspension between two worlds that has profound human consequences.
Deadly Divide is essential reading for anyone seeking to understand the tangled histories of environment, race, and nation at the US-Mexico border. It is a work of rigorous scholarship and deep humanity and a timely reminder that the natural world has always been part of the story we tell about who belongs and who does not.
Displaying 1 - 1 of 1 review