Check out the links below for more information on different tribes, etc.

Government (federal or tribal) related info:
Official website of the Lumbee Tribe
North Carolina Commission on Indian Affairs
Bureau of Indian Affairs-Office of Indian Education
National Congress of American Indians

Higher Education:
UNC-Pembroke - American Indian Studies
A Guide to Native American Studies Programs in the US and Canada
Carolina Indian Circle
UNC-Charlotte - Native American Student Organization
NC State American Indian Alumni Society

Other organizations:
Metrolina Native American Association
Triangle Native American Society