Recent Migration to the United States from Central America: Frequently Asked Questions [Updated January 29, 2019] [open pdf - 1MB]
From the Document: "Over the last decade, migration to the United States from Central America--in particular from El Salvador, Guatemala, and Honduras (known collectively as the Northern Triangle)--has increased considerably. Families migrating from this region, many seeking asylum, have made up an increasing share of the migrants seeking admission to the United States at the U.S.-Mexico border. In the past year, news reports of migrant 'caravans' from the Northern Triangle traveling toward the United States have sparked intense interest and questions from Congress."
CRS Report for Congress, R45489
Congressional Research Service: https://crsreports.congress.gov/