Combined with the process of World War II, talk about the role of anti-fascist alliance.

Before the start of World War II, the major imperialist countries and the Soviet Union pursued the policy of appeasement, preferring to sacrifice some interests and avoid war. As a result, fascism was unscrupulous, Britain and France were badly weakened, and the Soviet Union almost perished, seriously endangering the interests of great powers. After the Pearl Harbor incident, the United States entered the war, and the signing of the Atlantic Charter strongly promoted the establishment of the anti-fascist alliance. In this way, we concentrated on dealing with fascism, such as the three meetings before the victory, and even made plans for the post-war world. As for opening up a second front to support China and the Soviet Union, that was after the alliance.