Which U.S. President is associated with brokering peace in the Russo-Japanese War?

The U.S. President associated with brokering peace in the Russo-Japanese War is Theodore Roosevelt. In 1905, he facilitated negotiations between Russia and Japan, which had been engaged in a conflict over territory in Manchuria and Korea. Roosevelt's involvement was significant as he became the first American president to win the Nobel Peace Prize for his diplomatic efforts in this regard. His mediation helped bring an end to the war and resulted in the Treaty of Portsmouth, which not only marked a resolution to the conflict but also highlighted the growing role of the United States in international diplomacy during that era. This event is notable as it demonstrated America's emerging status as a global power and showcased Roosevelt's belief in negotiating peace through diplomacy rather than military intervention.