The misery of Mexican slum colonias has long been visible just across from many U.S. border towns. Over the past decade, however, despite the economic promise of NAFTA, the phenomenon has spread to the U.S. side.

Today, a half-million Texans live in more than 1,500 colonias that lack running water and sewage treatment. We follow Mexican immigrant Oscar Solís of Panorama, Texas, as he organizes his community to fight for changes.

A Spanish-language version is also available.