A recent article on the Upside Down World web site looks at immigration and remittances between El Salvador and the US. From the introduction to the article:
A rampant culture of impunity, combined with poverty and desperation after the war has led to constistantly high levels of migration. Strict immigration laws have punished those looking for livelihood improvements and deportation has spawned El Salvador's serious gang problem, further trapping the country in a cycle of violence, poverty, and... more immigration. An important lynch-pin in this cycle is remittances or remesas as they are known in Spanish: money sent home by working immigrants abroad.While the article has some logical jumps when it comes to cause and effect, it does give you an overview of some of the role remittances play in El Salvador's economy.