[HartleyMBaldwin]

But then in the next sentence, the writer says that Lyndon Johnson won the 1960 presidency. I’m so confused.

That might have been a typo, but there’s plenty of other unclear writing in the piece. How long is a jubilee, exactly?

[marktwain]

A jubilee is 50 years.

[Sicon]

“but there’s plenty of other unclear writing in the piece”

Yes, the writing, or maybe the editing, is atrocious. It almost sounds as if English is not the writer’s first language.