My son is in 3rd grade so I don’t think they fully get in to American history at this point. However the past two years they have discussed 9/11 and every year they attend a ceremony at the firehouse across the street from his school. He has brought home books from the library about WWII and the 9/11 attacks and he’s asked me about it, so I think he’s like me and taking and interest in American history.
When we were in school (graduated 17 years ago) we covered everything from the pilgrims up to current events, with a big focus on WWII (including Pearl Harbor) and the holocaust. The Vietnam war was covered as well but it doesn’t seem like it was covered for very long.
I'm not sure that everyone cares only about themselves, instead I think since social media the self centered ones have a platform to boost egos and push their beliefs, while the true people who do good prefer to do it behind the scenes, because they aren’t doing the good deeds and helping others for the attention.