Chase-Dunn writes
"The modern world-system can be understood structurally as a stratification system composed of economically, culturally, and militarily dominant core societies (themselves in competition with one another), and dependent peripheral and semi-peripheral regions. Some dependent regions have been successful in improving their positions in the larger core/ periphery hierarchy, while most have simply maintained their peripheral and semi peripheral positions. This structural perspective on world history allows us to analyze the cyclical features of social change and the long-term patterns of development in historical and comparative perspective."
In which ways, if any, has the United States government worked to retain its "core" status under the world system theory of global capitalism? Apply Chase-Dunn's World System theory interpretation to this question. This does not mean that you accept the theory, but that you learn how to apply it to generate explanation.