Why would L. Frank Baum write an entire story like the Wizard of Oz, just to explain what Populism was like?

Stories have a lot of symbolism, and people would be interested in reading a book more than a poem.

Explanation:

by improved communication.

“the iliad” (gr: “iliás”) is an epic poem by the ancient greek poet homer, which recounts some of the significant events of the final weeks of the trojan war and the greek siege of the city of troy (which was also known as ilion, ilios or ilium in ancient times).