Final answer:
The federal government holds land in trust for American Indians, Indian tribes, and Alaska Natives, but the specific number of acres is not mentioned. Alaska Natives received 44 million acres of land through the Alaska Native Claims Settlement Act in 1971.
Step-by-step explanation:
The federal government holds land in trust for American Indians, Indian tribes, and Alaska Natives. The exact number of acres held in trust is not specified in the provided information. However, there are several instances where Native American tribes have regained control of land through court settlements and legislation. For example, Alaska Natives received 44 million acres of resource-rich land through the Alaska Native Claims Settlement Act in 1971.