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Traffickers have used Central America as a stopover point since at least the 1970s. But the aggressive crackdowns on criminal organizations in Mexico and Colombia, coupled with strides in limiting smuggling across the Caribbean, have increasingly brought the powerful syndicates here, pushing the drug scourge deeper into small Central American countries incapable of combating it.

Most of the known cocaine shipments moving north, 84 percent of them, crossed through Central America last year, according to radar tracking data from American authorities — a sharp increase from 44 percent in 2008 and only 23 percent in 2006, the year President Felipe Calderón of Mexico took office and began his assault against the drug gangs in his country.

Responding to the pressure — and opportunity — the cartels have spread out quickly. Five of Central America’s seven countries are now on the United States’ list of 20 “major illicit drug transit or major illicit drug producing countries.” Three of those, Costa Rica, Nicaragua and Honduras, were added just last year.