1. The economic rise of the United States: After World War II, the United States became the only superpower and promoted the reconstruction of Western Europe and Japan through the Marshall Plan. The economic strength of the United States has recovered rapidly and grown rapidly, becoming the engine of the global economy. The economic rise of the United States has promoted the rapid growth of global trade and investment.

2. Scientific and technological progress: After World War II, the rapid development of science and technology, especially the breakthrough of information technology and communication technology, accelerated the process of globalization. These technological innovations have brought revolutionary changes to various fields and promoted the improvement of productivity and efficiency. ?

3. Establishment and cooperation of international organizations: After World War II, in order to maintain global peace and promote international cooperation, a series of international organizations such as the United Nations, the International Monetary Fund and the World Bank were established one after another. These organizations have played an important role in promoting trade, investment and financial cooperation and promoting economic development. ?

4. The rise of free trade and market economy: the liberalization of international trade and investment intensified after the war, and many countries gradually abandoned protectionist policies to promote the development of free trade. The popularity of the market economy model has also created conditions for rapid economic growth.

Generally speaking, the rapid development of the world economy after World War II is mainly due to the changes in the international situation after World War II, and new cooperation mechanisms and rules have promoted the prosperity and development of the global economy. This makes the economic ties between countries in the world closer and lays the foundation for economic globalization.