What is the author's tone in The World Turned Upside Down: Indian Voices from Early America by Colin G. Calloway?

Calloway's tone is a balance between the objectivity required of a history text, and a certain stridency reflecting outrage at the injustice delivered time and time again upon the Indian people of North America. Calloway is clearly motivated by an agenda to tell another side of the story, and to complicate the reader's ideas about European colonization. Through his often combative tone, Calloway challenges the reader, forcing the reader to re-evaluate the conventional colonization narrative.