A historian who Compares World Events during The Classical era to world events during the modern era is organizing history by

The U.S Civil War started because the North wanted to abolish slavery. The South wanted to keep slavery. The Civil War started because the South didn't want to have slavery abolished. It didn't work out so well for the South because the North won and took over the South land.That is how the U.S Civil War started.

Explanation:i'm Sorry if wrong.