Which treaty, arranged by Teddy Roosevelt, ended the Russo-Japanese War?

The Treaty of Portsmouth is the agreement that formally ended the Russo-Japanese War, which took place from 1904 to 1905. This treaty was negotiated under the auspices of U.S. President Theodore Roosevelt, who played a pivotal role in the discussions by inviting representatives from both Japan and Russia to the United States for negotiations. Roosevelt's involvement not only highlighted his interest in diplomacy but also cemented the United States' emerging role as a significant player on the international stage during the early 20th century.

The treaty was signed on September 5, 1905, at the Portsmouth Naval Shipyard in Kittery, Maine. Its terms required Russia to recognize Japan's interests in Korea and to cede control of Port Arthur and the southern half of Sakhalin Island to Japan. This outcome marked a significant shift in power dynamics in East Asia, establishing Japan as a rising military power.

Other treaties listed do not pertain to the Russo-Japanese War. The Treaty of Paris generally refers to a different agreement involving territorial disputes following the Spanish-American War. The Treaty of Versailles concluded World War I and addressed the restructuring of Europe after that conflict. Lastly, the Treaty of Saint-Germain dealt with the dissolution of the Austro-Hungarian