What is the author's tone in the novel, Abe Lincoln Grows Up?

The narrator’s tone consistently favors the white settlers of the American frontier because he believes in their cause to settle the continent and share their knowledge, faith, and democracy. There was no question of whether the valleys “rich with long slopes of black land and blue grass” and its resources should be settled, rather it was regarded as land for the taking (5). The other groups, by default, are given a tone of inferiority, disrespect, and disgust because their agendas are the opposite of the settler’s mission to expand American territory.