The question is somewhat ambiguous. Japan started fighting in China in 1933, so to be pedantic, we'd look at a 1930 census. From an American viewpoint, the war didn't start until the Japanese attack on Pearl Harbor, 7 December 1941.
Hiroshima had a population of 344,000 according to the 1940 census. I can't find anything between 1910 and 1933, but the 1910 census figure was 143,000.
Before and during WWII (1937-1945), against Japan, which Japan started by invading.
The Japanese, Hirohito was the Emperor of Japan during and just before WWII.
See website: Japan
To "convince" Japan to surrender in WWII.
Japan once bombed Pear Harbor before we entered WWII
127 million. bye! :) :)
Asia, specifically japan began a full scale invasion of china on July 7, 1937; shortly before WWII is considered to have started.
Japan during WWII
A lot of people were famous in WWII. Hideki Tojo, for example. He was sort of like the leader of Japan during WWII. But Hirohito was the emperor of Japan during WWII.
Japan during WWII.
In WWII, Japan attacked China, made an alliance with Germany and Italy and attacked the USA on December 7, 1941. The refusal of Japan to surrender resulted in the atomic bombing of Hiroshima and Nagasaki, after which Japan surrendered. Japan's invasion of China, (and the failure of the League of Nations to respond to the invasion), was one of the causes of WWII. Japan was not a neutral nation in WWII.