Carson's notions about Native Americans softened over the years. He found himself more and more in their company as he grew older. His thoughts about Native Americans became more understanding and more humane. He urged the government to set aside lands called reservations for their use. As an Indian agent, he saw to it that those under his watch were treated with honesty, fairness, and clothed and fed properly. Historian David Roberts believes his first marriage to an Arapaho women named Singing Grass, "softened the stern and pragmatic mountaineer's opportunism."