Newly obtained data on the unprecedented surge of border crossings over the past decade is shedding light on who entered the U.S. and where they went. Here is some information on the crossings, the data on 4.5 million migrants, and how The Associated Press obtained and analyzed it.
Millions of migrants crossed the border from Mexico over the last decade and were released in the United States with notices to appear in immigration court or report to an Immigration and Customs Enforcement office.
