What was the Impact of Uncle Tom's Cabin ?

The correct answer to this open question is the following.

The impact of the novel "Uncle Tom's Cabin" was that this novel helped to spread the abolitionism movement in the United States, basically in the Northern States.

The author of the book is Harriet Beecher Stowe, a woman that observed the way slaves were being treated in the southern plantations where they worked growing crops. When people read the book, they realized the atrocities of slavery in the southern states.

the exclusive possession or control of the supply or trade in a commodity or service.

the western roman empire flourished, but the eastern portion of the empire struggled.