Japan during World War I close of the war. The prosperity brought on by World War I did not last. Although Japan's light industry had secured a share of the world market, Japan returned to debtor-nation status soon after the end of the war. The ease of Japan’s victory, the negative impact of the Showa recession in 1926, and internal political instabilities helped contribute to the rise of Japanese militarism in the late 1920s to 1930s. Japan during World War I Japan participated in World War I from 1914 to 1918 in an alliance with Entente Powers and played an important role in securing the
War crimes in occupied Poland during World War II at Chełmno according to postwar verdict by West Germany, although up to 340,000 victims were estimated by the Polish Main Commission for Investigation of German Crimes in Poland (GKBZNwP), a predecessor of the Institute of National Remembrance. Following the Wannsee Conference of 1942, as part of highly secretive Operation Reinhard in occupied Poland, the German government built three regular killing centres with stationary gas chambers. It was the most deadly phase of the Final Solution, based on implementing semi-industrial means of killing and incinerating people. The new facilities included Treblinka extermination camp (set up in July 1942), Bełżec (March 1942),