China
China, the world's most populous nation at the time, had a tremendous impact on World War 2. Since 1927, the Chinese Communist Party (CCP), under the leadership of Mao Zedong, has been engaged in a protracted civil war with the Chiang Kai-Nationalist sheik's party. In 1937, the two sides ultimately agreed to a cease-fire and join forces to combat the Japanese. Despite being huge, the Chinese military lacked training and was ill-equipped. It did, however, put up a fierce fight against the Japanese troops. With more than 20 million men and women fighting in the military or working as civilians in the production industry, the Chinese people mobilized as well to help the war effort.
Several crucial industrial sites that produced weapons and other supplies for the Allied forces were also located in China. For instance, the Chengdu Arsenal Aircraft Factory produced more than 11,000 aircraft throughout the conflict. Over 35 million people died or were injured in the country throughout the conflict, resulting in significant fatalities. But its contribution helped shift the balance against Japan, which ultimately led to their defeat.