In or around 1978, America’s character changed. For almost half a century, the United States had been a relatively egalitarian, secure, middle-class democracy, with structures in place that supported the aspirations of ordinary people. You might call it the period of the Roosevelt Republic. Wars, strikes, racial tensions and youth rebellion all roiled national life, but a basic deal among Americans still held, in belief if not always in fact: work hard, follow the rules, educate your children, and you will be rewarded, not just with a decent life and the prospect of a better one for your kids, but with recognition from society, a place at the table.

This unwritten contract came with a series of riders and clauses that left large numbers of Americans – black people and other minorities, women, gay people – out, or only halfway in. But the country had the tools to correct its own flaws, and it used them: healthy democratic institutions such as Congress, courts, churches, schools, news organisations, business-labour partnerships. The civil rights movement of the 1960s was a nonviolent mass uprising led by black southerners, but it drew essential support from all of these institutions, which recognised the moral and legal […]