The Americo-Liberian settlers did not relate well to the indigenous peoples they encountered, especially those living in the more isolated interior. Colonial settlements were raided by the Kru and Grebo from their inland chiefdoms. Americo-Liberians promoted religious organizations to set up missions and schools to educate the native populace. Americo-Liberians formed into a small elite that held disproportionate political power; indigenous Africans were excluded from birthright citizenship in their own land until 1904.