I read a collection of comics from the 1950s. There were stories about Hannibal, Julius Ceasar, Emperor Claudius, and other historical figures. The issue with Civil War stories covered topics like the Emancipation Proclamation. Today we don't put anything in kids' media that can't be sold.
It’s unfortunate too, because history has a lot of stories that would make for great media. But it seems there is a war on history these days. At least recent history.