Answer
When tribes first encountered Europeans, they were a power to be reckoned with because the combined American Indian and Alaska Native population dominated the North American continent. Their strength in numbers, the control they exerted over the natural resources within and between their territories, and the European practice of establishing relations with countries other than themselves and the recognition of tribal property rights led to tribes being seen by exploring foreign powers as sovereign nations, who treatied with them accordingly.
However, as the foreign powers’ presence expanded and with the establishment and growth of the United States, tribal populations dropped dramatically and tribal sovereignty gradually eroded. While tribal sovereignty is limited today by the United States under treaties, acts of Congress, Executive Orders, federal administrative agreements and court decisions, what remains is nevertheless protected and maintained by the federally recognized tribes against further encroachment by other sovereigns, such as the states. Tribal sovereignty ensures that any decisions about the tribes with regard to their property and citizens are made with their participation and consent.
