Lies My Teacher Told Me.. Columbus and the Flat Earth

Fer instance. did you know that:

Washington Irving created the myth that everyone thought the world was flat til Columbus proved otherwise.

or that

In a ceremony at the White House, President Warren G. Harding was inducted as member of the Klu Klux Klan.

Excerpts from the book:
Everything Your American History Textbook Got Wrong
by James W. Loewen. Simon & Schuster, 1995.