What was the first British “educational blockbuster” miniseries to be carried by PBS?

Kenneth Clark’s “Civilisation,” first broadcast on BBC2 in 1969, was the first British “educational blockbuster” miniseries to be carried by PBS.

It was followed by Alistair Cooke’s “America” (BBC, 1972) and Jacob Bronowski’s “Ascent of Man” (BBC, 1974).