Final answer:
The federal government and its agencies, including the U.S. Forest Service and the Bureau of Indian Affairs, are responsible for tasks like managing public lands and helping Native Americans manage their affairs. Agencies such as the U.S. Army Corps of Engineers may operate hydroelectric power plants on federal lands.
Step-by-step explanation:
The tasks mentioned in the question are likely performed by the federal government and its various agencies in the United States, which are responsible for the management of public lands, wildlife refuges, national parks, operation of hydroelectric power plants, and helping Native Americans manage their affairs. The U.S. Forest Service manages national forests and grasslands, preserving their health, diversity, and productivity. This falls in line with tasks such as managing public lands and national parks. The Bureau of Indian Affairs is dedicated to the administration and management of 55.7 million acres of land held in trust by the United States for American Indians, Indian tribes, and Alaska Natives. Therefore, it helps Native Americans manage their affairs, including their rights to natural resources.
When it comes to operating hydroelectric power plants, agencies like the U.S. Army Corps of Engineers might be involved as some of these facilities are situated on federal lands managed by this agency. Additionally, historical figures like President Roosevelt have influenced the establishment of protected lands and the concept of wildlife conservation for recreation and future generations.