Weird, how you keep taking this out of context from what I actually said. I said learn about, which, if you learned about Dred Scott, you very likely learned about the court decision under that court, you already openly acknowledged that most people would even be able to remember that outside of when they originally learned about it most likely in some sort of educational setting.
I never said anything about remembering trivia questions later in life, my point was only that they would learn about it (via its notable decisions) someday in a most likely school-like setting. Do you want to continue arguing about stuff I never said?
If you ever learned about slavery in the lead up to the U. S. civil war, I’d be surprised if it wasn’t taught (whether or not you remember it is another matter). It was a pretty momentous decision widely recognized as one of the worst in US History. It stated at its basic level in a opinion written by the chief justice (Taney) that Black people could never be citizens of the United States and that Congress had no authority to stop or limit the spread of slavery into American territories.
I guess if you were in a school where you learned the “War of Northern Aggression” was over states rights it’s possible.