Final answer:
The abolitionist movement in the 1850s was a radical reform movement aiming for the immediate end of slavery, marked by the passionate advocacy of leaders like Frederick Douglass and William Lloyd Garrison, and was intertwined with the women's rights movement.
Step-by-step explanation:
The abolitionist movement in the 1850s is best described as a diverse and fractious movement that radicalized to oppose slavery more directly and urgently. Its advocates, which included figures like Frederick Douglass and William Lloyd Garrison, employed strategies ranging from moral persuasion to political action and even armed resistance. This period saw slavery increasingly cast as a national sin, with radical calls for its immediate end, sometimes resulting in violence as seen in John Brown's raid on Harper's Ferry.