4. Theodore Roosevelt
Roosevelt’s boldest actions came in the area of natural resources. At his urging, Congress created the Forest Service (1905) to manage government-owned forest reserves, and he appointed a fellow conservationist, Gifford Pinchot, to head the agency. Simultaneously, Roosevelt exercised existing presidential authority to designate public lands as national forests in order to make them off-limits to commercial exploitation of lumber, minerals, and waterpower.