* Women: Before Postmodernism, the American literary canon was dominated by male authors. However, in recent decades, the canon has expanded to include more women authors, such as Toni Morrison, Alice Walker, and Maya Angelou.
* Minorities: Before Postmodernism, the American literary canon was also dominated by white authors. However, in recent decades, the canon has expanded to include more minority authors, such as James Baldwin, Ralph Ellison, and Sherman Alexie.
* LGBTQ+ authors: Before Postmodernism, LGBTQ+ authors were largely excluded from the American literary canon. However, in recent decades, the canon has expanded to include more LGBTQ+ authors, such as Audre Lorde, James Baldwin, and Sarah Schulman.
* International authors: Before Postmodernism, the American literary canon was focused primarily on American authors. However, in recent decades, the canon has expanded to include more international authors, such as Salman Rushdie, Gabriel García Márquez, and Chimamanda Ngozi Adichie.
The inclusion of these previously marginalized voices has made the American literary canon more diverse and inclusive, and has helped to create a more accurate representation of American literature.