By the mid-1700s, many Plains nations survived on North America’s largest land mammals: bison. They ate its meat, made the hides into winter coats and blankets, and used the bones and horns for tools. But in the following decades, millions of bison would be deliberately slaughtered, threatening the survival of Plains societies. Andrew C. Isenberg shares what led to the animal's near-extinction. Lesson by Andrew C. Isenberg, directed by Rémi Cans, Atypicalist.