This useful little site provides a historical overview of spirituals as well as information on various composers, singers, and songs.
The Fisk Jubilee Singers still exist. They still represent Fisk University and record and tour. Their official site offers a brief history of the group and current tour information.
The Library of Congress has constructed a useful site on the Indian Removal Acts and the forced relocation of Native Americans during the 1830s. It provides maps, documents, links, and recommended reading.
This small site posted by PBS provides a short overview of Indian removal during the 1830s and links to more information and documents.