The Treaty of Portsmouth, which ended the Russo-Japanese War, was signed in which U.S. state?

The Treaty of Portsmouth formally ended the 1904–05 Russo-Japanese War. It was signed on September 5, 1905, after negotiations lasting from August 6 to August 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 intermediary approached by the Japanese side was the United States President Theodore Roosevelt, who had publicly expressed a pro-Japanese stance at the beginning of the war. Later, Roosevelt had begun to show concerns on the strengthening military power of Japan and its impact on long-term United States interests in Asia. In February 1905, Roosevelt sent messages to the Russian government via the US ambassador to St Petersburg. Initially, the Russians were unresponsive. At this point, the Japanese government was also lukewarm to a peace treaty. However, after the Battle of Mukden, which was extremely costly to both sides in terms of manpower and resources, Japanese Foreign Minister Komura Jutarō judged that the time was now critical for Japan to push for a settlement.