The U.S.–Mexico border is a physical boundary and a working corridor whose role in the novel exceeds the act of crossing it. Through Santa Teresa’s expanding industrial landscape, its divided neighborhoods, and the routines of border inspection, the boundary links economic movement to uneven infrastructure and unsettled questions of identity and jurisdiction.

Setting and Physical Boundary

In Oscar Fate’s passage through the border region, the American-side town of Adobe is described as a former adobe factory reduced to a collection of houses and appliance stores strung along a long main street. At its end, an illuminated, empty lot leads directly to the American border post. The short distance between a commercial settlement and the checkpoint makes the border feel less like a distant frontier than an everyday extension of the road.

Fate then advances three hundred feet to the Mexican border. There he must leave his car, open his suitcase, show his vehicle papers, passport, and press identification, and fill out forms. The Mexican officers’ faces are marked by exhaustion. From the customs-house window he sees the tall fence dividing the countries; four birds perch on its far end with their heads tucked into their feathers. The crossing is a sequence of separate inspections, but the fence and the closely spaced posts make the two sides part of one continuous landscape.

Santa Teresa and the Border Economy

The border is also the outer edge of Santa Teresa’s urban growth. The city’s northern outskirts reach the U.S.–Mexico divide, while its southern and western margins extend through rail lines, makeshift soccer fields, garbage-filled gullies, poor neighborhoods, and industrial parks. From the city, the horizon of the maquiladoras marks an economy tied to production and movement across the boundary. The novel presents a city expanding toward the border while struggling to support its own rapid demographic growth.

Chucho Flores describes Santa Teresa as a place with factories and maquiladoras, a steady flow of workers from other cities, Central American immigrants, a cocaine cartel, and an urban infrastructure unable to keep pace with population growth. His inventory puts lawful industry, migration, and illicit trade within the same account of the city. The border is not shown as a simple barrier between separate economies: it is a nearby passage within a system of production and movement whose pressures Santa Teresa cannot contain.

Cross-Border Networks and Unequal Reach

The cross-border connections include organized commercial networks. Klaus Haas tells reporters that Pedro Uribe, the father of Antonio, owns more than a hundred cargo trucks transporting goods from maquiladoras in Hermosillo and Santa Teresa. The trucks cross the border every hour or half hour. Pedro Uribe also owns property in Phoenix and Tucson, while his brother Joaquin has hotels in Sonora and Sinaloa and coffee shops in Santa Teresa. These details give the boundary a regular commercial rhythm: freight and ownership extend across it, connecting industrial production to businesses and property on both sides.

Such mobility contrasts with the exposed conditions of the city’s less affluent residents. In Fate’s drive around Santa Teresa, the border appears at the far north beyond districts of uneven development; elsewhere, slums surround industrial parks, and the city’s outskirts are described through neglected lots and limited infrastructure. The novel places the conspicuous reach of cross-border capital alongside a city whose public and residential spaces remain strained by growth.

Identity, Inspection, and Narrative Significance

For Fate, the border also sharpens a question of identity. After buying food near the highway, he recalls identifying himself simply as American and wonders why he did not say African American. He questions whether the United States can be considered foreign when he could walk back to it, and whether identity changes by place until a person becomes, by extension, nobody. The scene links the border’s practical closeness to the instability of national and racial labels; the boundary does not resolve belonging, but makes its categories newly visible.

The border thus gathers together several strands of the novel’s setting: routine state inspection, a tall dividing fence, an expanding industrial city, and networks moving goods and money across national lines. Its crossings are concrete and regulated, yet the economic and social systems around them resist a clean division into separate worlds. Santa Teresa grows beside the boundary, connected to it and burdened by forms of movement that its infrastructure and institutions struggle to manage.