NBC News’ Cynthia McFadden reports on the dark history of Native American boarding schools in the U.S. An effort is ongoing to use ground-penetrating radar to look for the unmarked graves of children who may be buried at Red Cloud Indian School in South Dakota. Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.