1. Hitler’s expansion after coming to power was gradual. For example, he first occupied the non-military Rhine River area, then annexed Austria and Czechoslovakia, and finally attacked Poland. At this time, Hitler had already He figured out the bottom line of the Western powers, so his conspiracy succeeded step by step. The attack on Poland that kicked off World War II was actually not because Hitler was not sure, but because Hitler was ready to deal with Britain and France and the German military already had such strength. 2. The Munich Conspiracy was a policy of appeasement of Nazi Germany by Western powers in order to stabilize Hitler and avoid war, and at the same time to divert disaster eastward to the Soviet Union. As a result, the conference ceded the Sudetenland region of Czechoslovakia to Germany. However, Germany was not satisfied with a piece of Sudetenland and annexed the entire Czechoslovakia. 3. People in Western countries were war-weary after World War I. The First World War was too harsh on Germany. Many Western people generally sympathized with Germany. Moreover, the Soviet Union established after World War I was hated by Western countries. In order to avoid war, Western countries brought disaster to the East. The policy of appeasement was implemented. 4. Britain and France misjudged the war. France still relied on the Verdun defense system that blocked the German attack in World War I to block Germany in World War II. However, Germany bypassed the entire defense line and caught France by surprise. Furthermore, at this time, the anti-fascist countries did not form a united front and fought independently, and neither the United States nor the Soviet Union, the two major countries in the world, participated in the war. Furthermore, France's combat thinking was backward. At this time, Nazi Germany was incomparable to France in both combat thinking and fighting will. 5. Germany's raid on Poland is inevitable, because apart from France, only Poland is not occupied by Germany in central Europe. Poland and Germany have many conflicts in history. 6. Germany's attack on France went smoothly, and France was captured in less than half a year. However, the attack on Britain suffered a serious setback, and neither the navy nor the air force was a match for Britain. 7. According to the German navy and air force, it was impossible to capture Britain, so Hitler planned to blitz the Soviet Union. If the Soviet Union surrendered and Britain was completely isolated in Europe, it could force Britain and the United States to negotiate peace or even allow Britain to surrender without a fight. 8. The Soviet Union has a vast territory and huge strategic depth. Moreover, the Soviet Union’s heavy industry is the second largest industrial country after the United States. After the Soviet Union was attacked, the United States and Britain provided a large amount of assistance. 9. The symbol of establishment is that the United States revised the Neutrality Act, the United States promulgated the Lend-Lease Act, and the United Kingdom and the United States issued the Atlantic Charter. If it were a middle school textbook, it should be the third one. 10. The Yalta Agreement was based on the balance of power between the United States and the Soviet Union. Later, the United States gave up its wartime alliance with the Soviet Union. It stipulated the international policy after the end of World War II and had a positive side. However, in order to win the Soviet Union's participation in the war against Japan in the Pacific and to curry favor with the Soviet Union to maintain its own peace, the United States betrayed China's interests and forcibly divided China's territory. This was a perfect manifestation of the appeasement policy, also known as the Munich Conspiracy in the Far East. 11. Stalingrad is not only an important economic and resource town, but also the political significance of taking this city is huge, which can damage the morale of the Soviet army. 12. Divided into European battlefield and Asian battlefield. After 1944, the European battlefield was divided into two battlefields: the Eastern Front and the Western Front. 13. The end was marked by Japan’s surrender on August 15, 1945. 14. The background of Japan’s surrender, the battlefield in Southeast Asia suffered setbacks, the Soviet Union declared war on Japan and annihilated the Kwantung Army, the US military has begun to land on the Japanese mainland, and the Chinese battlefield has been delayed for too long, and it is no longer able to launch an offensive. 15. The harm of war and the avoidance of war are very general and complex issues. You'd better check professional information.