Powell was a true explorer, leading expeditions into the Rocky Mountains and along western rivers, as well as an anthropologist who studied native American populations and their languages. He was the first to demarcate what continues to be the most significant "separation line" in the world -- right through the middle of the United States. Find out where and why that is from this video, and read more about John Wesley Powell here.
Powell with a Paiute Indian at the Grand Canyon in Arizona, circa 1872.
