You dont learn about modern american history in history classes, because thats what TV and Movies are for.
Why read about the Korean War when you can watch MASH (which is about Vietnam) or Gran Torino (which is about how cool it is to be racist).
I’ve said this before elsewhere, but I like bringing it up whenever I get a chance: Curtis LeMay’s (guy in charge of “strategic” bombing) wikipedia page doesn’t once mention the Korean War
friend you knew the answer to this before posting
Most Americans do not know that the Korean War occurred.