book I'm reading that surprised me. In The Lost City: Discovering the Forgotten Virtues of Community in the Chicago of the 1950s
In 1930, the proportion was only about half. And in 1890, only 6 percent of that population was in high school.
And I thought about that; I think only one of my grandparents finished high school. (Maybe only one attended.)
Imagine that: about a hundred years ago, it was kind of a big deal to have a high school diploma.