When America was founded, Sasse the historian reminds us, “nobody commuted to work. People worked where they lived.” Before the “generational segregation” of modern life, children saw adults working, and were expected to pitch in. The replacement of “the gritty parenting of early America” by “a more nurturing approach” coincided with the rise of mass schooling. In 1870, fewer than 2 percent of Americans had high-school diplomas. An average of one new high school a day was built between 1890 and 1920, and by 1950, more than 75 percent of Americans were high-school graduates.