# Canonical recap data for Treaty of Portsmouth Signed (1905)
# Source: https://recap.at/1905/treaty-portsmouth
# Format: YAML 1.2 (UTF-8). Generated at request time.
slug: treaty-portsmouth
canonicalUrl: "https://recap.at/1905/treaty-portsmouth"
title: Treaty of Portsmouth Signed
subtitle: President Theodore Roosevelt mediated peace between Russia and Japan, earning the Nobel Peace Prize and establishing U.S. diplomatic influence in Asia.
recapType: global_event
eventStatus: concluded
startDate: 1905-09-05
datePrecision: day
year: 1905
decade: 1900
country:
name: United States
slug: united-states
summaryShort: The Treaty of Portsmouth formally ended the 1904–1905 Russo-Japanese War. It was signed on September 5, 1905, after negotiations from August 6 to 30, at the Portsmouth Naval Shipyard in Kittery, Maine, United States. U.S. President Theodore Roosevelt was instrumental in the negotiations and won the Nobel Peace Prize fo
summaryLong: The Treaty of Portsmouth formally ended the 1904–1905 Russo-Japanese War. It was signed on September 5, 1905, after negotiations from August 6 to 30, at the Portsmouth Naval Shipyard in Kittery, Maine, United States. U.S. President Theodore Roosevelt was instrumental in the negotiations and won the Nobel Peace Prize for his efforts, the first ever American recipient. The treaty recognized Japan's hegemony in Korea, awarded it Russia's lease on the Liaodong Peninsula, control of the Russian-built South Manchuria Railway, and the southern half of the island of Sakhalin (Karafuto).
heroImageUrl: "https://upload.wikimedia.org/wikipedia/commons/thumb/9/92/Japan_Russia_Treaty_of_Peace_5_September_1905.jpg/1280px-Japan_Russia_Treaty_of_Peace_5_September_1905.jpg"
heroImageCredit: Wikipedia · "Treaty of Portsmouth"
importance: 72
sourceConfidence: 75
keyFacts: []
timeline: []
sources:
- url: "https://en.wikipedia.org/wiki/Treaty_of_Portsmouth"
  title: Treaty of Portsmouth
  provider: Wikipedia
related: []
categories:
- war
metaDescription: The Treaty of Portsmouth formally ended the 1904–1905 Russo-Japanese War. It was signed on September 5, 1905, after negotiations from August 6 to 30, at the Por
wikidataQid: Q548067
archiveSnapshots:
- url: "https://web.archive.org/web/20260520183343/https://en.wikipedia.org/wiki/Treaty_of_Portsmouth"
  capturedAt: 2026-05-20
  label: Treaty of Portsmouth
  originalUrl: "https://en.wikipedia.org/wiki/Treaty_of_Portsmouth"
