4. Many of Seuss' "bigger books" were political allegories. "The most political ones were written after the war: 'Horton Hears a Who!' was anti-discrimination; 'The Sneetches' was an opposition to anti-Semitism; 'Yertle the Turtle' was about the rise of Hitler, an anti-fascist children's book; 'The Lorax,' about taking care of the environment; and 'The Butter Battle Book.' There are other ones with political messages, but those are the most obviously engaged."