History. Liberia was founded in 1821, when officials of the American Colonization Society were granted possession of Cape Mesurado by local De chiefs for the settlement of freed American slaves.African-American immigrants were landed in 1822, the first of some 15,000 to settle in Liberia. Liberia: History-History Founding to 1980 Liberia was founded in 1821, when officials of the American Colonization ...