Are you intending to claim that the second half of the 20th century isn't contemporary?
I'm not a historian, but I've understood "contemporary" as a term that refers to events that have occurred in the lifetimes of active historians. Given that a decent chunk of the US's population was alive in 1968 and hasn't even retired yet, it probably fits neatly into that category.
I'm not a historian, but I've understood "contemporary" as a term that refers to events that have occurred in the lifetimes of active historians. Given that a decent chunk of the US's population was alive in 1968 and hasn't even retired yet, it probably fits neatly into that category.