D is the answer because it says in the text
After the Civil War and reconstruction the New South became more diversified. It was mainly agricultural before but the new embraced the industrial part as well.
Many types of cultures use these but my real answer is d) irrigation systems. Hope it helps
The U.S. Constitution uses federalism to divide governmental powers between the federal government and the individual state governments. The Tenth Amendment tells us that all powers not granted to the federal government are reserved to the states. Anwser is Federalism
