Quote:
Despite enjoying widespread readership in their own era, a significant body of women's novels from the 1800s in America was effectively sidelined by the twentieth century's intellectual establishment,
Though a drift away from overtly moral writing was already discernible as American culture grew more secular throughout the nineteenth century
The two come from different eras, but this does not necessarily mean two different centuries of millennials. You have eras even decades apart.
The bold sentence just tells you this