What is one piece of evidence presented in the video that supports the argument that 'The Wizard of Oz' is a commentary on social issues?

The widespread acceptance of Littlefield's interpretation in American history textbooks by the 1980s.

Theme And Social Issues Lesson Plan for Grade 14

Name: Theme and Social Issues
Author: Insta~Lesson

I can analyze how a theme reflects or comments on social issues.

1
Henry Littlefield, a high school teacher, connected "The Wonderful Wizard of Oz" to the social and economic issues of the Gilded Age.
2
Littlefield interpreted characters like the Scarecrow as the farmer, the Tin Woodman as the industrial worker, and the Cowardly Lion as William Jennings Bryan.
3
Some scholars believe the Emerald City represents the dazzling new urban consumer culture, while others maintain the book is simply a children's story.