What was the effect of Harriet Beecher Stowe’s book Uncle Tom’s Cabin?

"would you like to hear mademoiselle reisz play? " asked robert, coming out on the porch where she was. of course edna would like to hear mademoiselle reisz play; but she feared it would be useless to entreat her. "i'll ask her," he said. "i'll tell her that you want to hear her. she likes you. she will come." he turned and hurried away to one of the far cottages, where mademoiselle reisz