Final answer:
Frederick Douglass lectured on abolition and gained support for the anti-slavery movement while in Great Britain, where he also secured his freedom with the help of British friends.
Step-by-step explanation:
While Frederick Douglass was in Great Britain, he lectured on abolition and the anti-slavery movement. As a prominent figure in the fight against slavery, Douglass used his powerful oratory skills to drum up moral and financial support from British and Irish antislavery societies. He met with famous British abolitionists, like Thomas Clarkson, and was successful in fostering international support for the abolitionist movement. His time in Great Britain also involved securing his freedom, as British abolitionist friends ultimately bought his freedom from his Maryland owner. Upon his return to the United States, Douglass continued his work by publishing his own abolitionist newspaper, the North Star, highlighting the destructive nature of slavery.