In 1959, the Supreme Court ushered in a new era of Indian law, which recognizes Indian tribes as permanent governments within the federal constitutional system and, on the whole, honors old promises to the Indians. Drawing together historical sources such as the records of treaty negotiations with the Indians, classic political theory on the nature of sovereignty, and anthropological studies of societal change, Wilkinson evaluates the Court's work in Indian law over the past twenty-five years and considers the effects of time on law.