Brazil, last seen obsessing over rumors of a US plot to take over the Amazon, has since begun to fight back against real-life invaders. Various observers report that the Brazilian military has gone on the offensive on its own soil this month to push out heavily armed militias controlled by drug cartels that have set up shop in the lawless Wild West territory that is Amazonas State. With thousands of troops, dozens of warplanes, and even drone aircraft on the scene, the central government is making an unprecedented show of force.The offensive points to a couple of trends in Dilma’s Brazil that signal opportunities for partnership with the United States. The first is a willingness to tackle drug smuggling in a reasonably serious way. Brazil’s political classes aren’t trying to please the United States; they are outraged at the threat to national sovereignty represented by the power of the increasingly brazen cartels.The second interesting point is that Brazil’s Amazonian adventure requires close political and military cooperation with Colombia. Colombia has been the staunchest American ally in South America over the last decade. Hugo Chavez and his Axis of Anklebiters have done their best to isolate and pillory Colombia, and the close cooperation between Colombia and the US has been a favorite whipping boy of Latin leftists who see all kinds of dark annexationist plots at work.Brazil’s march to the center continues. Celso Amorim, recently appointed defense minister, served as foreign minister under President Lula; it will be interesting to see if the era of warm feelings continues under the leadership of a figure associated with the more nationalist and anti-US wing of the Brazilian foreign policy establishment.