Most of the time, White's watercolor paintings definitely did not portray calmness because his paintings often portrayed Native Americans at war, hunting, or partaking in sacrifice. They definitely documented the lives of Woodland peoples...he acted as an artist mapmaker, documenting the Native American culture surrounding him. Though some of his pieces did portray European culture, they were vastly outnumbered by those portraying Native American culture.
The answer is, therefore, "They documented the lives of Woodland peoples"