> “I must study Politicks and War that my sons may have liberty to study Mathematicks and Philosophy. My sons ought to study Mathematicks and Philosophy, Geogra

> “I must study Politicks and War that my sons may have liberty to study Mathematicks and Philosophy. My sons ought to study Mathematicks and Philosophy, Geography, natural History, Naval Architecture, navigation, Commerce and Agriculture, in order to give their Children a right to study Painting, Poetry, Musick, Architecture, Statuary, Tapestry and Porcelaine.” — John Adams, 1780 (https://www.masshist.org/digitaladams/archive/doc?id=L17800512jasecond https://www.masshist.org/digitaladams/archive/doc?id=L178005...) I think your "rise in wealth" answer is correct, but note that it is not just people being able to afford a career in the humanities: it's also people who studied STEM/whatever and now have jobs with a bit of free time to spend on reading, or a bit of wealth to donate to keep their culture alive.