qnli question: What do Jonathon Israel claim caused the change that eventually led to the revolutions of the latter half of the 18th centure and early 19th century? sentence: He instead focuses on the history of ideas in the period from 1650 to the end of the 18th century, and claims that it was the ideas themselves that caused the change that eventually led to the revolutions of the latter half of the 18th century and the early 19th century.