There are many reasons for the rise of the two countries. First, it was inseparable from the international environment at that time. After the end of World War II, the United States and the Soviet Union quickly changed from former allies to competitors, and fought fiercely on a global scale. Japan is a deep-water bomb for the United States to resist Soviet Russia's expansion in Asia, and West Germany (Germany split into two countries after World War II) is a bridgehead for Britain and France to resist Soviet Russia's expansion in Europe. Therefore, in order to support the two countries and not make them a burden, Europe and the United States gave up compensation to Japan, only demanding a small amount of compensation from Germany and providing a large amount of assistance and economic support to the two countries to help rebuild. Two other countries swept Europe and Southeast Asia during World War II, plundering a lot of wealth and laying the foundation for their post-war rise. Two other countries used to be industrial countries and have a strong industrial base. After receiving the assistance from Europe and America, it naturally developed by leaps and bounds like adding a booster. In addition, both countries are restricted in armaments. Without an army, this financial power will enable the two countries to invest more money in post-war development.