As a non-US millennial I've never had the context of time, space or culture to get Dylan or ever get interested in getting him, he is firmly placed very, very deep in 1960s Americana.
Of Pete Seeger I've only (knowingly) heard the song "If It Can't Be Reduced", and that's only very recently.
I don't know much about Woody Guthrie either. All of these people are historical cultural landmarks that everyone else is referring to, so I've heard their names over and over, but if you didn't grow up in the US, you haven't been served their music through the radio everywhere you went as you grew up.