According to the US Constitution, states have legislative powers that a. are delegated to the federal government. b. relate to currency, the economy, and trade. c. are not assigned to the federal government. d. relate to the declaration of war and the military.

C. Are not assigned to the federal government.

Explanation:

"The powers not delegated to the United States by the Constitution, nor prohibited by the states, are reserved to the states respectively, or to the people."

A. is crossed off

B. is crossed off

C. We keep

D. is crossed off

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explanation:

nothing certain is known about what happened, but it seems that the country declined gradually, perhaps due to bad government, or, more likely, due to a series of bad harvests, which resulted in widespread and recurrent famine.