What was the name of Harriet Beecher Stowe’s novel that impacted American views on slavery?

Uncle Tom's Cabin

Which powerful sorceress helped Jason in his quest for the Golden Fleece but later turned vengeful? What animated movie had a snowman named Olaf? Who became first chancellor of unified Germany under Kaiser Wilhelm I? During which war was the Charge of the Light Brigade famously made? Who was the lead singer of the British rock band Queen?