Answer: Today, most American Indians' preference for self-identification is to use their tribal affiliation.
Explanation: Tribal affiliation is an important part of Native American identity and culture, and many Native Americans prefer to identify themselves by their specific tribal nation rather than using broader terms like "American Indian" or "Native American." This reflects the diversity and complexity of Native American cultures and histories in the United States. While world systems theory is a theoretical framework used in sociology and anthropology to understand global economic and political systems, and the Department of War (now known as the Department of Defense) is a US government agency responsible for national defense and military policy, neither of these are directly relevant to how most Native Americans prefer to self-identify.