The document discusses several topics related to ethnicity and nationalism: 1. It examines ethnic groups in Rwanda like the Hutus and Tutsis and how European imperialism exacerbated tensions between them. 2. It analyzes patterns of ethnic clustering in the United States for groups like African Americans, Asian Americans, and Latino Americans. It also discusses historic migration patterns of African Americans. 3. It discusses the concept of apartheid in South Africa and how the white-ruled government forcibly segregated and classified ethnic groups. 4. It explores the relationship between ethnicity, nationality, and self-determination, and how the rise of nation-states in Europe contributed to tensions leading up to World Wars I and