[1] American Colonization Society documents list him as age nine when he emigrated from Baltimore to Liberia with eight relatives on the ship Oswego in 1823.

[6] He also wrote the lyrics to the Liberian national anthem, which the country officially adopted upon its independence from the American Colonization Society in 1847.

Warner's main concern as president was his government's relationship with the area's indigenous people, particularly those in the interior of the country.

Led by Benjamin J. K. Anderson, the expedition resulted in the signing of a treaty between the Americo-Liberian government and the community of Moussadou in today's Guinea.

[8] Anderson took careful notes describing the people, the customs, and the natural resources of the areas he passed through, eventually publishing a report on his journey.