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C. Collect Taxes
Congress could not collect taxes from the states and depended on the states for money. If the state denied the money, Congress could do nothing.
The term that references a period of economic growth as measured by a rise in GDP is an economic expansion. It is the increase in economic activity.
The south didn't grow crops very much, instead they grew cotton which made them rely on the North for crops and other materials. So the correct answer would be "B" since that seems like the most plausible answer.