Treaty of Portsmouth Day

What Is Treaty of Portsmouth Day?

September 5th marks the anniversary of the signing of the Treaty of Portsmouth in 1905, the agreement that ended the Russo-Japanese War. Signed at the Portsmouth Naval Shipyard in New Hampshire, USA, by Japan's plenipotentiary Jutaro Komura and Russia's plenipotentiary Sergei Witte, the treaty brought roughly a year and a half of war to a close.

Key Terms of the Treaty

• Russia ceded the southern half of Sakhalin (south of the 50th parallel) to Japan
• Russia recognized Japan's right to guide, protect, and oversee Korea
• Both Japan and Russia agreed to withdraw troops from Manchuria and return it to Qing China
• With Qing China's consent, Russia transferred railway rights between Changchun and Port Arthur to Japan

The negotiations were brokered by US President Theodore Roosevelt, whose mediating role earned him the Nobel Peace Prize the following year, in 1906.

A Treaty That Brought No Celebration at Home

Although Japan had narrowly won the Russo-Japanese War, the human and financial cost had been enormous, and much of the public expected a substantial war indemnity from Russia in return. The Treaty of Portsmouth, however, included no indemnity payment whatsoever. Public anger over this outcome boiled over into the Hibiya Incendiary Incident, in which crowds gathered at Hibiya Park in Tokyo and rioted in protest.

A Treaty That Redrew the Map of East Asian Power

The Treaty of Portsmouth secured Japan's international standing as a power capable of defeating a major European empire, dramatically expanding its influence over the Korean Peninsula and Manchuria. This outcome laid the groundwork for Japan's later annexation of Korea in 1910 and its expansion into Manchuria, shaping East Asian geopolitics for decades to come.

Tips for Marking This Day

• Read up on the Russo-Japanese War and the Hibiya Incendiary Incident
• Learn about the key figures involved, including Jutaro Komura and Theodore Roosevelt
• Reflect on the true cost of war, even one that ends in "victory"
• Trace the historical ties between Portsmouth, USA, and Japan

The Uneasy Cost Behind a Wartime Victory

The Treaty of Portsmouth is a striking reminder that victory on the battlefield doesn't always translate into an outcome the public can accept. September 5th is a day to reflect on how a single treaty, signed on distant American soil, went on to reshape the course of Japanese and East Asian history.