The author of the novel uncle tom's cabin was:

harriet tubman
frederick douglass
harriet b. stowe
stephen douglas

 Harriet B. Stowe

Further detail:  

Harriet Beecher Stowe's novel, Uncle Tom's Cabin, was hugely popular with abolitionists around the world.  The book was the 2nd-best selling book of the 19th century -- coming in behind only the Bible (the perennial bestseller).

In response to Stowe's book, British women compiled a petition that got so many signatures it filled 26 leather bound volumes, in which they urged their sisters in America to keep up the fight to free the slaves.  The impact of Stowe's book shows that what can be done fighting with the pen is just as mighty as what might be done with a sword!

the awenser wuold be slaves

answer; (d) i believe that the correct answer is americans finally ran out of ammunition;