I believe that China's Population is beginning to climb by the 1940's despite the Fall and the continued fighting between forces of the Rising Sun and Chinese Liberation fighters. So I would say that China's population is 130 Million. The Empire of the Rising Sun ( Japan) has a population of about 68 million Japanese, 12 Million Koreans and perhaps 900,000 Formosan's. The bulk of the population is in Japan but there are 3.5 Million Japanese on Formosa, 1 Million on Hanan Island, 800,000 in Manchuria and 1.2 Million in China.