Regional economic integration has emerged as a significant focus for China in the post-pandemic era, as the nation seeks to establish mutually beneficial relationships with external economies and promote national development. In this study, the entropy method is employed to construct an index system tailored specifically to the four provinces within the Yangtze River Delta region. This research aims to explore the advantages and challenges of regional economic integration in China by conducting a comparative analysis of the Yangtze River Delta. The study also evaluates the merits and drawbacks of different integration models, drawing on examples from developed countries. The ultimate goal of the research is to provide insights and recommendations for China's regional economic integration, thus contributing to the country's overall prosperity. The results revealed that factors such as economic downturns caused by the pandemic have led the United States to experience a resurgence of racism and xenophobia, reminiscent of historical periods of American nativism, marked by economic insecurity and rapid demographic changes due to mass immigration. However, unlike previous eras with unrestricted immigration, the U.S. has tightened border policies and reduced the number of immigrants, using violent methods to expel unauthorized immigrants, such as Mexican migrant workers, along with their children born in the U.S., forcing them to move to a country where they may not speak the language or understand the culture.
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