A very nice Kirkus Review!

Two important historical figures from separate worlds come together for the common purpose of freedom.
From the first line of this work of creative nonfiction, the author makes clear the contrasts between Frederick Douglass and Susan B. Anthony: The cabin in which the slave, Frederick, was born had clay floors; the two-story house in which Susan was born had floors of polished wood. Despite differences in race, class and upbringing, Douglass and Anthony determined to be friends despite the taboos against cross-racial friendships. Both Slade’s text and Tadgell’s watercolor illustrations emphasize the passion each had for social justice as well as the lengths to which they both went to maintain their friendship. Often, characters in the background peer at them, looking disgusted or scandalized. In one illustration, enemies throw rotten eggs at them; Douglass’ angry expression and Anthony’s upraised fist speak to their determination to make their friendship an example of how America should be. The backmatter, which includes a photograph of bronze sculptures in Rochester, New York, of Douglass and Anthony having tea together, also offers useful information from the author in which she delineates the facts versus the fiction in the story.
This biographical gem places the spotlight on a friendship far ahead of its time. (Picture book/biography. 6-10)

https://www.kirkusreviews.com/book-reviews/suzanne-slade/friends-for-freedom/