What feelings & emotions was Stowe trying to appeal to in her readers?

I think Stowe was trying to instill a sense of sympathy if not empathy in the reader.  Stowe chose to portray intimate stories to show the harm being done to individual humans. To the modern reader, Uncle Tom's Cabin may appear over-sentimental and preachy, but Stowe wanted to inspire a strong emotional reaction of indignation in her readers.