On the Texas side of the U.S. border with Mexico, an estimated half a million people live in colonias, impoverished subdivisions that often lack basic services. Take our video tour of some of the worst — and most improved — conditions. 

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Emily Ramshaw was the editor-in-chief of The Texas Tribune from 2016 to 2020. During her tenure, the Tribune — billed “one of the nonprofit news sector’s runaway success stories” — won a Peabody...