As the debate over immigration reform heats up, the topic of border security—especially on the southwest border with Mexico—looms larger. Washington policymakers ask: How many miles of fence, how many Border Patrol agents, how many billions of tax dollars will be enough to finally “secure” the border? Ultimately, an effective border security policy requires a reliable security partner in Mexico. Thankfully, the objectives of Mexico’s new government are to engineer a more secure, more prosperous, and more rule-of-law-oriented future.