Final answer:
David Walker's 1829 Appeal to the Colored Citizens of the World was a radical denouncement of slavery and colonization, asserting African American ownership over the United States due to their suffering and calling for active resistance against oppression.
Step-by-step explanation:
David Walker made a significant contribution to the abolitionist movement with his Appeal to the Colored Citizens of the World in 1829. In this radical and fervent document, Walker channeled the energy of decades of black protest by denouncing colonization, asserting that the United States belonged to African Americans more than to whites because they had paid for it with their blood and tears.
Literate and educated, Walker's voice was especially powerful as he called on Black people to actively resist slavery and take action against racism, using violence if necessary. His Appeal combined moral arguments, religious fervor, and a call for immediate emancipation, aligning with the broader abolitionist movement that emphasized persuasion and moral awakening against slavery.