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Today in History: Roosevelt brokers peace, war ends at Portsmouth

9/5/2026

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Summary

Story summary

On September 5 1905, U.S. President Theodore Roosevelt brokered the Treaty of Portsmouth at the Portsmouth Naval Shipyard in Kittery, Maine, ending the Russo-Japanese War. The agreement granted Japan dominance in Korea, Russia’s former Liaodong lease, the South Manchuria Railway, and the southern half of Sakhalin, earning Roosevelt the first American Nobel Peace Prize.

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Story summary

On September 5 1905, U.S. President Theodore Roosevelt brokered the Treaty of Portsmouth at the Portsmouth Naval Shipyard in Kittery, Maine, ending the Russo-Japanese War. The agreement granted Japan dominance in Korea, Russia’s former Liaodong lease, the South Manchuria Railway, and the southern half of Sakhalin, earning Roosevelt the first American Nobel Peace Prize.