What was the author of Uncle Tom's Cabin, Harriet Beecher Stowe's,
position concerning slaveru?

Harriet Beecher Stowe is in favor of the abolition of slavery and wants the freedom of slaves.

Explanation:

Harriet Beecher Stowe's "Uncle Tom's Cabin," tells the story of a slave named Uncle Tom. The novel is an anti-slavery novel, supporting the abolitionists' fight for freedom from slavery.

In writing this novel, Harriet Beecher Stowe's stance on the issue of slavery can be seen through her depiction of the slaves and Uncle Tom. The novel presents a perspective in favor of the slave's freedom, bringing into emphasis the harsh realities of the slaves and their deplorable lives. Her novel also inspired abolitionists to join the anti-slavery movement, and also seem to demand the abolishing of the system.

Thus, we can infer that Harriet Beecher Stowe is against slavery.