How did the chinese use federation

Chinese federalism refers to political theories which argue that China's central government should share sovereignty with regional entities, under a form of federalism. Such proposals were made in the early twentieth century, in connection with the end of the Qing dynasty; as well as recently, with a view to providing checks against the power of the central government, as well as settling the relationship between Mainland China, Taiwan, Hong Kong, Macau, and other potential political entities.

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what are the options so i can answer it

d) iowa i believe is the answer