Republic of China, by 1941, had one quarter of the country under Japanese control.
Step-by-step explanation:
The Second Sino - Japanese War was fought out of military conquest held during 1937 to 1945, fought between the Japanese Empire and the Republic of China. The Republic of China had the support from the Union of Soviet, but later as the time period was coinciding with the World War II, it got mixed up with other fights.
Japanese controlled one quarter of the nation of China by 1941. This one quarter was the eastern coast of China which was under control of Japan. This control in power was gained a result of second Sino - Japanese War.