The premise is actually an interesting one, and is related to this short video at PragerU:
The Strange Death of Comedy by Owen Benjamin
The Left, including the media and educational systems have done a very good job of divorcing people from their cultural anchors as Americans in order to be able to promote their corrosive, destructive, and divisive concept of 'multiculturalism'. They have gone out of the way to scrub a common history from their teachings of history and instead present diametrically opposed teachings that do not leave any room for a middle ground to be occupied peacefully by both sides.
So, I do believe...yes, we ARE disconnected from a common history. We are now people living in a land occupied by neighbors whose history is alien to us.
Mike Rowe