Conflicts & Resolutions · Treaty · Peace

Treaty of Portsmouth

1905 · 20th century · Part of the Russo-Japanese War

The Treaty of Portsmouth ended the Russo-Japanese War. It was signed on 5 September 1905 at Portsmouth, New Hampshire, after talks mediated by US President Theodore Roosevelt. Russia recognised Japan's paramount interest in Korea, transferred its lease of the southern Liaodong peninsula with Port Arthur and the railway south of Changchun, and ceded southern Sakhalin, but Japan received no indemnity, which provoked riots in Tokyo.

Treaty of Portsmouth
Image: World Imaging · CC BY-SA 3.0 · Wikimedia Commons

Mentioned in 3 state histories

Kwantung OblastKarafuto PrefectureKwantung Leased Territory

See also

Cite this entry
APA
The Epoch Institute. (2026). Treaty of Portsmouth. In The Epoch Institute Encyclopedia. https://the-epoch-institute.org/encyclopedia/treaty-of-portsmouth
MLA
“Treaty of Portsmouth.” The Epoch Institute Encyclopedia, The Epoch Institute, 2026, https://the-epoch-institute.org/encyclopedia/treaty-of-portsmouth. Accessed .
Chicago
The Epoch Institute. “Treaty of Portsmouth.” The Epoch Institute Encyclopedia. 2026. https://the-epoch-institute.org/encyclopedia/treaty-of-portsmouth.
Harvard
The Epoch Institute (2026) ‘Treaty of Portsmouth’, The Epoch Institute Encyclopedia. Available at: https://the-epoch-institute.org/encyclopedia/treaty-of-portsmouth (Accessed: ).

Last reviewed October 2026Random entry ↻