Final answer:
Frederick Douglass challenged the power of slave owners through his powerful speeches, the publication of his autobiography, and the establishment of his own abolitionist newspaper.
Step-by-step explanation:
Frederick Douglass challenged the power of slave owners in several ways. Firstly, he used his powerful speaking skills and commanding presence to deliver public lectures on slavery, electrifying his listeners. Additionally, he published his autobiography, 'Narrative of the Life of Frederick Douglass, An American Slave Written by Himself', in which he exposed the brutalities of slavery and identified the white people who had oppressed him.
Moreover, Douglass fought for the end of slavery by highlighting how it destroyed families, both black and white. He also established his own abolitionist newspaper, the North Star, which helped to spread his message and advocate for emancipation.