The Circassian genocide is the example that comes to my mind first. In my experience, most people, at least in Western countries, when they hear “Circassian”, they will immediately think I’m actually talking about Cardassians, a race of fictional aliens from Star Trek (or they’ll at least remark on how similar these words sound).
I also think the Milan Congress is an event more people should know about. This was a congress on Deaf education in 1880 that declared a ban on sign languages in schools, causing trauma and poverty and general harm to Deaf people for nearly a century until around the time of Stokoe’s research on ASL.
Really, the amount of history that people should know is abundant, but a lot of it is also very clearly more important to know if you live in a certain area, right?
Never think that geocentrists were stupid. They were wrong, certainly, but they were not stupid: while it doesn’t take much intellect to initially conclude that Earth is the center of the solar system, it does take a very great amount of intellect to rationalize away the mountain of evidence to the contrary.
This is not a comment about people who voted or are planning on voting for Kamala Harris — this is an entirely unrelated observation about a completely different topic.