Introduction to the China Theater Command Center of the World Anti-Fascist War: In 1941, the Pacific War broke out. On December 9, the Nationalist Government officially declared war on Japan in Chongqing. On December 23, China, the United States, and the United Kingdom held a military conference in Chongqing. The Three Kingdoms Military Alliance was formally formed. On January 3, 1942, the Allied Powers announced that Chiang Kai-shek was the supreme commander of the Allied China Theater and assumed command of the joint forces in China, Thailand, Vietnam and other regions. The American General Stilwell served as the supreme commander-in-chief of staff. , and concurrently serves as the Commander-in-Chief of the China-Burma-India Theater. Chongqing became the command center of the world anti-fascist war in the Far East.