Because borderlands and border issues are not limited to the US-Mexico border, a couple of stories regarding border issues in South America.
Brazil and Bolivia have signed an agreement to work together to combat narco-trafficking. The agreement will see the armed forces of each country working together along their 3000+ km (1875+mile) border in an attempt to reduce the ease of traffickers crossing the porous border in the Amazonian basin.
Concern over porous borders has also led to mobilization of armed forces in Ecuador, where the government dispatched more troops to the border with Colombia to prevent the invasion of “irregular groups” of Colombians. While the article mentions the mobilization is designed to prevent the FARC and smugglers from entering into Ecuador, it also seems possible that the military presence is intended to discourage Colombia from violating Ecuadorian sovereignty in its pursuit and murder of FARC rebels, as happened in 2008 when Colombia killed FARC leader Raul Reyes and 16 others in Ecuador.