Sam Sacks searches for the definition of classic American literature:
In “Democracy in America,” de Tocqueville observed that Americans esteemed the arts and sciences more for their practical applications than for their abstract value—hence the popularity of newspapers, religious treatises, and self-help books. Reading itself was not done for the purposes of something as perversely theoretical as enlarging one’s soul; it needed to have some tangible function in the here and now: “Democratic nations may amuse themselves for a while with considering the productions of nature; but they are excited in reality only by a survey of themselves.”
A look through the Classics section of bookstores—in America or any of the Western democracies—bears out de Tocqueville’s instincts. The offerings are wide-ranging, tilting toward diversity and inclusion. But, more to the point, artistic brilliance is no longer the most important determining factor. What makes a classic today is cultural significance. Authors are anointed not because they are great (although many of them are) but because they are important.
In other words, the current criteria for classics are more a matter of sociology than of aesthetics.