There are several major results of Theodore Roosevelt’s philosophy about conservation, but the best option from the list would be "the creation of <span>national parks"</span>
Theodore Roosevelt is also known as the conservationist president because he had personal concerns with the environment. Under his presidency, he protected wildlife, created the United States Forest Service and established 150 national forests, 51 federal bird reserves, 4 national game preserves, 5 national parks, and 18 national monuments.
