The photographer John Moore has focused on all aspects of undocumented immigration to the United States along its border with Mexico for the past decade. His access to immigrants during their journey, and to US federal agents tasked with deterring them, sets his pictures apart. Moore has photographed the entire length of the southern border, and traveled extensively throughout Central America and Mexico.

Undocumented: Immigration and the Militarization of the United States-Mexico Border, by John Moore, is published by powerHouse Books