This dual system of government present in the United States is called , which is a governance structure whereby the federal government and the state governments coexist through a shared power scheme. State laws may not conflict with federal laws, including the U. S. Constitution.

Federalism

Explanation:

This dual system of government present in the United States is called federalism, which is a governance structure whereby the federal government and the state governments coexist through a shared power scheme. State laws may not conflict with federal laws, including the U.S. Constitution.

Federalism is a dual system of government in which power is divided between a central national government and other governmental units such as a regional government or state government.

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answer; the changing age structure of the population;