Former Mexican President Felipe Calderon left office almost four years ago, but during his six-year term he presided over one of the most violent periods in modern Mexican history. Taking office in 2006, Calderon initiated a military-backed crackdown
on organized crime that led to peaks in violence between 2010 and 2012. Calderon left office in 2012, and homicide rates have fallen and risen again under his successor
, Enrique Peña Nieto.