Portsmouth, Treaty of

Portsmouth, Treaty of,

1905, treaty ending the Russo-Japanese War. It was signed at the Portsmouth Naval Base, New Hampshire, on Sept. 5, 1905. Negotiations leading up to the treaty began in the spring of 1905 when Russia had suffered severe defeats and Japan was in financial difficulties. Therefore, both nations indicated a desire for peace. Germany, the United States, and Great Britain were instrumental in forcing conciliation between the belligerents. However, the United States and Britain exacted certain concessions from Japan before smoothing the way for the treaty. President Theodore RooseveltRoosevelt, Theodore,
1858–1919, 26th President of the United States (1901–9), b. New York City. Early Life and Political Posts

Of a prosperous and distinguished family, Theodore Roosevelt was educated by private tutors and traveled widely.
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 demanded that Japan follow the Open DoorOpen Door,
maintenance in a certain territory of equal commercial and industrial rights for the nationals of all countries. As a specific policy, it was first advanced by the United States, but it was rooted in the typical most-favored-nation clause of the treaties concluded
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 policy in Manchuria and return the region to Chinese administration. In the Taft-Katsura agreement of July, 1905, Roosevelt agreed to Japanese dominance in Korea in return for American freedom of action in the Philippines. Great Britain had the Anglo-Japanese treaty extended to cover all of E Asia and in return also gave Japan a free hand in Korea. Under the terms of the Portsmouth agreement, Russia was compelled to recognize Korea's independence and the "paramount political, military, and economic interests" of Japan in Korea. Russia also agreed to place Manchuria again under the sovereignty of China, and all foreign troops were to be removed. The railway lines in S Manchuria, constructed by Russia, were ceded to Japan without payment. The disputed Liaodong peninsula (see LiaoningLiaoning
, province (2010 pop. 43,746,323), c.58,400 sq mi (151,295 sq km), NE China, on the Bohai and Korea Bay. The capital is Shenyang (Mukden). A part of Manchuria, it encompasses the Liaodong peninsula and the plain of the Liao River.
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), containing the ports of Dalian and Port Arthur (see LüshunLüshun
, formerly Port Arthur,
Jap. Ryojun, former city, SW Liaoning prov., China, at the tip of the Liaodong peninsula. It was formerly combined with Dailian (Dairen) into the joint municipality of Lüda; it now is an adminstrative unit of Dalian.
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, was turned over to Japan, as was the southern part of the island of SakhalinSakhalin
, formerly Saghalien
, island (c.29,500 sq mi/76,400 sq km), off the coast of Asian Russia, between the Sea of Okhotsk and the Sea of Japan; separated from the Russian mainland on the west by the Tatar Strait and from Hokkaido, the northernmost island of
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. Japan also obtained fishing rights in the waters adjacent to the Russian Far East. The Treaty of Portsmouth marked the temporary decline of Russian power in East Asia and the emergence of Japan as the strongest power in the area.
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