The new 2020 edition is not compatible with the previous edition. New lessons have been added and layout changed. Part One has the fewest changes and covers roughly the same material. In Part Two, five lessons have been removed at the beginning and five new lessons have been added at the end to cover current events since the last printing. There have also been two changes to the literature package: "Indian Child Life" by Charles Eastman has taken the place of "The Sign of the Beaver" and "Katy’s Box" by Mary Evelyn Notgrass McCurdy is used instead of "Katy." Because of the changes, the new books will not be compatible with the old books; however, Notgrass has digital downloads of the previous edition consumable books available on their website.