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This article assesses U.S. security policy on U.S.-Mexico land ports of entry, before and after 9/11. It tracks U.S. security policy’s impact over time by using multiple interrupted time-series (mit) and yearly time-series of border activity measures from 1994 to 2009. The results demonstrate that, other things being equal, post-9/11 U.S. security policy changes had marginal effects; in other words, policy responses make no difference when their performance is compared on, before, and after 9/11; thus, U.S.-Mexico economic integration may be a stronger determinant of security at U.S.-Mexico land ports of entry

Post-9/11 U.S. Homeland Security Policy Changes and Challenges: A Policy Impact Assessment of the Mexican Front