Book excerpt: Plan Colombia and the Mérida Initiative represented an unprecedented effort by Washington to stabilize fragile democracies in Latin America by shoring up the Colombian and Mexican security forces, respectively. From Peril to Partnership evaluates the extent to which the US government achieved its stabilization objectives. US assistance was more helpful to Colombia than Mexico, which adopted a more militarized approach. This book highlights the importance of the private sector, party system, and security bureaucracy in facilitating progress-and how their absence obstructs it.