As an immigrant from the US to the UK, this isn't unique to the US. The reality is that there is so much history out there that it is very hard to get a solid overview of it which weaves together into a coherent narrative. There's just not enough time. Its why independent resources like youtube and video games which actually care about history are so important.

(Its still reasonable to be annoyed by the way. My personal annoyance is that my school taught a lesson about George Washington Carver which didn't include a discussion of the nitrogen cycle or nitrogen-fixing bacteria.)