The U.S. incarcerates more noncitizens than anywhere else in the world. On any given day in the U.S., thousands of people — adults and children — are in government custody, sometimes for indefinite periods of time.

The purpose of detention is logistical — a way to hold people suspected of having committed civil border-related offenses. But detention is inherently punitive. And as the immigration enforcement machinery has expanded to become the behemoth it is today, it affects an increasing number of people.