My own opinion of the millennials I know (mostly family members) is that very few or none of them are interested in what shaped America or our shared history. They know everything there is to know about popular music, tv, movies, etc. and are very sharp on the electronic gadgets that dominate modern life today.
But curiosity about past events or why we are where we are at this point in time?....no thank you, they don't care in the slightest.
I hasten to add they're all very good people...even my liberal family members and relations. But I wish they thought life was more than having the latest gadgets, popular culture, or visiting DisneyWorld.
One very significant factor would be few had any close family members that served during wartime. Not grandfathers, fathers, brothers, uncles, etc. Nada, zip, nobody.
My grand father served, my father and FIL served, I served along with many from my cohort.
Our immediate life experiences spanned serious aspects of life.
Fewer and fewer young adults grew up with intact families, and few had real hardship, or sacrifice.
The same applies to their teachers, coaches etc.
So what pay attention to history? Why even teach it?