Theodore Roosevelt was the 26th President of the United States, serving from 1901 to 1909. He was known for his progressive reforms and strong foreign policy, which included expanding the role of the United States in world affairs, taking on large businesses known as trusts, conserving natural resources, and preserving unique landscapes of national significance. Some of his most effective achievements were in conservation, where he added enormously to the national forests in the West, reserved lands for public use, and fostered great irrigation projects. Roosevelt was also a "trust buster" who forced the dissolution of a great railroad combination in the Northwest and took on corporations and monopolies. He won the Nobel Peace Prize for mediating the Russo-Japanese War, reached a Gentleman’s Agreement on immigration with Japan, and sent the Great White Fleet on a goodwill tour of the world. Roosevelt was also an advocate of the strenuous life and physical fitness, and he participated in sports, hiking, and hunting trips.