Treaty of Portsmouth Treaty of Portsmouth 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 war of 1904–05 was fought between the Empire of Russia, an international power with one of the largest armies in the world, and the Empire of Japan, a nation which had only recently industrialized after two-and-a-half centuries of isolation. A series of
Russo-Japanese War Japan's road to World War II had begun not upon winning the Russo–Japanese War, but when it lost the peace. The effects and impact of the Russo–Japanese War introduced a number of characteristics that came to define 20th-century politics and warfare. Many of the technological innovations brought on by the Industrial Revolution first became present on the battlefield in the Russo–Japanese War. Weapons and armaments were more technological than ever before. Technological developments of modern armaments, such as rapid-firing artillery and machine guns, as well as more accurate carbine rifles, were first used on a mass scale in the Russo–Japanese