Final answer:
Frederick Douglass escalated his abolitionist activities by fleeing to Britain, then returned to the U.S. to publish the 'North Star' newspaper and promote the end of slavery as a speaker.
Step-by-step explanation:
After being beaten, Frederick Douglass decided to escalate his efforts in the fight against slavery. Fearing retribution for identifying his abusers by name in his autobiography, Douglass fled to Great Britain, where he garnered international support for the abolitionist cause. Upon his return to the United States, his freedom purchased by British supporters, Douglass began publishing the abolitionist newspaper North Star and continued his work as an influential orator to end slavery.