Answer:
- Holocaust
- Great Depression
- World War II
- Civil War
Step-by-step explanation:
Holocaust is a good idea because it helps people remember the past it tells a story that has a big lesson to it, and lots of events Happened in the Holocaust
Civil War is as well because it tells a story on how the Union fought against Slavery while the Confederates support it.
By the way this is your idea. These are only suggestions.
I hope it helps!