Final answer:
The Montana-based conservation organization founded in 1887 with Theodore Roosevelt as its first president is the Boone and Crockett Club, which focuses on wildlife habitat conservation, ethical hunting, and the prevention of over-harvesting game animals.
Step-by-step explanation:
The conservation organization founded in 1887, Boone and Crockett Club, has tirelessly worked to preserve North American wildlife habitat, prevent over-harvesting of game animals, promote sportsmanship, and eliminate market hunting. With Theodore Roosevelt as its first president, the club has made substantial contributions to wildlife conservation and ethical hunting practices. Roosevelt's efforts, which were influenced by his passion for sportsmanship and his relationship with conservationists like John Muir, led to the establishment of numerous wildlife refuges and the catalyzation of public support for conservation, culminating in the creation of the National Park Service in 1916.
While Theodore Roosevelt and Gifford Pinchot advocated for utilitarian conservation, John Muir and his Sierra Club pushed for preservation based on intrinsic value. These early conservation efforts paved the way for the protected areas like Yellowstone and Yosemite that we value today. As president, Roosevelt protected vast areas of wilderness and was inspired by Muir during their time together in Yosemite, which led to the protection of natural landscapes and the establishment of conservation policies, leaving a lasting legacy as a wildlife advocate.