After the civil war the cost of living decreased because

The options of the question are, A) Consumers wanted imported goods. B) Sanitation and medical care improved. C) Men took public transportation to work. D) technology made manufacturing more efficient.

The correct answer is D) technology made manufacturing more efficient.

After the Civil War, the cost of living decreased because technology made manufacturing more efficient.

After the Civil War ended in 1865, the federal government did not increase the amount of taxes to pay for the war. What the government did was to borrow and print money that was not supported by gold. Then, the government stopped printing money to reduce the debt, and the cost of goods and services diminished. And technology helped, too. After the Civil War, the cost of living decreased because technology made manufacturing more efficient.  

the correct answer is d: "party organizers, volunteers, voters, and elected officials."