In 2015, more than 1.8 million people crossed the European Union’s borders illegally, up from 280,000 detections of illegal border crossings in 2014.
From 1965 to 2015, more than 16 million Mexicans migrated to the U.S. in one of the largest mass migrations in modern history. But Mexican migration to the U.S. has slowed in recent years. Today, Mexico also increasingly serves as a land bridge for Central American immigrants traveling to the U.S.
Out of 45 million U.S. arrivals by air and sea whose tourist or business visas expired in fiscal 2015, the agency estimates that about 416,500 people were still in the country this year.