Why was ralph ellison considered a prolific author and unique for his time period?

Ralph Ellison, born on March 1, 1914 in Oklahoma City, Oklahoma, studied music before moving to New York City and working as a writer. He published his bestselling, acclaimed first novel Invisible Man in 1952; it would be seen as a seminal work on marginalization from an African-American protagonist's perspective. Ellison's unfinished novel Juneteenth was published posthumously in 1999.

your list doesn't mention any of them at all.

and what does "these" mean anyway ?

answer:

the majority of cambodians living today were born after the khmer rouge was ousted in 1979 and some who survived can forget how bad it was. when khmer rouge forces seized phnom penh on april 17, 1975, the couple was living with eight of their children in a rural town called kampong chhnang.

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