Recognize continuing tribal governments, historical homelands, and the consequences of U.S. expansion. is the correct choice. Tribal nations are contemporary governments, and their histories should be studied with reliable, diverse sources.

Rivers connect mountain snowpack, valleys, ecosystems, farms, and communities. Seasonal runoff helps replenish waterways, while reservoirs and diversion structures change how water is available. River management therefore involves tradeoffs among agriculture, energy, habitat, and recreation.