Migrant crossings at U.S.-Mexico border are down. What’s behind the drop?

By VALERIE  GONZALEZ  Associated Press McALLEN, Texas (AP) — A recent decline in arrests for illegal crossings on the U.S. border with Mexico may prove only temporary. The drop in January reflects how the numbers ebb and flow, and the reason usually goes beyond any single factor. After a record-breaking number of encounters at the…