Which of the following noted American authors wrote works that supported slavery?

a. Ralph Waldo Emerson
b. Henry David Thoreau.
c. Edgar Allan Poe
d. Harriet Beecher Stowe

None of them really.

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The answer would be D) Harriet Beecher Stowe. He wrote Uncle Tom's Cabin in 1852 before the American Civil War.

To determine which of the noted American authors wrote works that supported slavery, we need to examine the writings and views of each author.

a. Ralph Waldo Emerson: Emerson was a prominent writer and Transcendentalist philosopher. He is well-known for his essays and speeches advocating for individualism, self-reliance, and the abolition of slavery. Therefore, his works do not support slavery.

b. Henry David Thoreau: Thoreau, a close friend of Emerson, also opposed slavery. His most famous work, "Civil Disobedience," promotes the idea of nonviolent resistance to unjust laws and government actions. While he did not directly address the issue of slavery in this essay, his stance on civil liberties suggests that he was against slavery.

c. Edgar Allan Poe: Poe was primarily known for his poetry and short stories, which focused on horror and mystery themes. While he did not explicitly write about slavery in his works, there is no evidence to suggest that he supported it.

d. Harriet Beecher Stowe: Stowe, on the other hand, is best known for her influential novel "Uncle Tom's Cabin," which vividly depicted the harsh realities of slavery. Her work played a significant role in raising awareness about the brutality of slavery and was instrumental in fueling the abolitionist movement. Therefore, she wrote works that condemned slavery, not supported it.

In conclusion, among the listed authors, none of them wrote works that supported slavery.