Who published "The Liberator," a significant anti-slavery newspaper?

William Lloyd Garrison published "The Liberator," a crucial anti-slavery newspaper that played a pivotal role in the abolitionist movement in the United States. First published in 1831, Garrison used the paper as a platform to advocate for immediate emancipation of all enslaved individuals and to speak against the injustices of slavery. His eloquent writings stirred public opinion and mobilized support for the abolitionist cause. Garrison's fierce rhetoric and unwavering commitment to ending slavery made "The Liberator" highly influential in raising awareness and promoting activism against the institution of slavery.

Although other notable figures mentioned, such as Frederick Douglass and Sojourner Truth, were also integral to the abolitionist movement, they were not the founders of "The Liberator." Douglass had his own publication, "The North Star," and Truth was known for her powerful speeches and activism, while Thoreau is best known for his philosophical writings on civil disobedience and nature, rather than directly engaging with the anti-slavery movement through a newspaper like Garrison did. Thus, Garrison's dedicated efforts and significant impact through "The Liberator" solidify his role as the correct answer.