Vox: Today, the US is facing a migration crisis on its southern border with Mexico. Thousands of people from Central America, especially Guatemala and Honduras are fleeing their home countries, taking a dangerous journey north through Mexico, and claiming asylum in the US. How did this crisis begin? Much of it can be traced back to the 1970s cocaine trade. Cocaine, which is mostly produced in Colombia, used to be shipped by boat and plane across the Caribbean. But in the 80s and 90s, the US cracked down on this route, so traffickers started shipping their drugs through central america and overland to Mexico. This created a violent and competitive turf war between gangs and organizations in Guatemala and Honduras. After the governments cracked down, violence only increased, which is forcing people to flee, to the US, today.