In their 1996 book The Next War, former Secretary of Defense Caspar Weinberger and Peter Schweitzer concoct some troubling scenarios they imagine could confront the United States. One is with Mexico: It's 1999, and a radical nationalist comes to power with the assistance of drug traffickers, resulting in a flood of migrants and drugs across the US boundary. In response, the Pentagon sends 60,000 troops to the border region. Tensions between the two countries mount over the next few years, leading to a full-scale US invasion of Mexico that restores law and order within six months. In constructing this nightmare scenario, the authors draw on a long history of depicting undesired immigrants as invading hordes and the international boundary as a line of defense. Peter Andreas recounts this hawkish vision in his provocative and highly persuasive Border Games: Policing the US-Mexico Divide. He argues that predictions of an inevitable march toward greater levels of militarization in the region--of which the Weinberger/Schweitzer vision is the most extreme--ignore the necessity of maintaining a porous boundary because of the significant and intensifying levels of economic integration between the United States and Mexico.

Still, as part of the US government's war on drugs and "illegal" immigrants in the border region, the enforcement regime has grown dramatically over the past two decades, as chronicled by Andreas. The antidrug budget of the Immigration and Naturalization Service, for example, rose 164 percent between fiscal years 1990 and 1997, while the overall budget for the INS nearly tripled between FY 1993 and 1999, from $1.5 billion to $4.2 billion, with border enforcement the biggest growth area. At the same time, transboundary trade has reached unprecedented heights because of the 1994 implementation of NAFTA. This exacerbates the challenge of "enforcement." As a 1999 government report cautioned, "Rapidly growing commerce between the United States and Mexico will complicate our efforts to keep drugs out of cross-border traffic." With a daily average of 220,000 vehicles now crossing into the United States from Mexico--and only nine large tractor-trailers loaded with cocaine required to satisfy annual domestic demand in the United States--the task facing US authorities is daunting.

Given such practical contradictions, it's the creation of an image of boundary control that has been most significant. As Andreas explains--and this is his well-written book's central point--the escalation of border enforcement is less about deterring drugs and migrants than it is about symbolism. In other words, state elites are more concerned about giving a good performance for reasons of domestic political consumption than they are about realizing the stated goals of boundary enforcement. In fact, the political-economic costs of too much success serve to limit enforcement. As one high-level US Customs official cited in Border Games stated, "If we examined every truck for narcotics arriving into the United States along the Southwest border.... Customs would back up the truck traffic bumper-to-bumper into Mexico City in just two weeks--15.8 days.... That's 1,177 miles of trucks, end to end."

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