Children arriving at the southern border without their parents have presented a political and humanitarian challenge for the past three presidents.
Their numbers began rising considerably after 2009, when 19,418 children were taken into custody at the border, according to U.S. Customs and Border Protection. Unaccompanied minors peaked in 2014, with 68,000 apprehensions. Analysts say 2021 is on pace to break that record, with more than 600 children arriving daily to the U.S.-Mexico border. Most are teenagers seeking asylum.