1. The document discusses categorization and definitions of social groups in Sub-Saharan Africa, noting that terms like "tribe" are problematic as they were imposed by European colonizers and do not reflect the fluid nature of pre-colonial African social identities. 2. It notes the dangers of categorization, particularly how colonial practices of "divide and rule" used definitions of difference to create conflicts and tensions between groups. 3. Several topics are discussed including nationalism, ethnicity, secret societies, voluntary associations, group identity, war, peace, and states. Throughout, it examines the constructed and negotiated nature of social identities and questions anthropological practices of categorization.