"A Key to Uncle Tom's Cabin" played a significant role in furthering the abolitionist cause by reinforcing the claims made in her novel. It provided readers with a more in-depth understanding of the realities of slavery and helped to counter the pro-slavery arguments of the time. The book was widely read and contributed to the ongoing debate about slavery in the United States, ultimately helping to galvanize the abolitionist movement.Through "A Key to Uncle Tom's Cabin," Stowe sought not only to defend her work but also to continue her fight against the injustices of slavery, using both fiction and documented reality to make a compelling case for the abolition of slavery.