Sometimes a book can help change history. One book that certainly did was Uncle Tom’s Cabin, written by Harriet Beecher Stowe. It was a book that ___1___ against slavery（奴隶制）.
As Harriet Beecher Stowe ___2___ her book, there were over 3.5 million slaves in the United States. Slaves were usually in the cotton-growing states of the South. The Northern States had ___3___ slavery. Yet, most Northerners were not strongly against slavery. They did not ___4___ that slavery continued in the South.
