This graph shows the gross domestic product (gdp) manufactured in the united states from 1800 to 1900. greatly increased from 1800 to 1900. greatly decreased from the onset of the civil war to 1900. slowly decreased in 1800 and again in 1900. slowly increased after 1880.

greatly increased from 1800 to 1900.

The gross domestic product (GDP) manufactured in the United States from 1800 to 1900 greatly increased. Following the civil war there was a period of extraordinary rapid economic growth in the United States, so that the real gross domestic product multiplied more than seven times. The mainly factors that contributed to this unprecedented growth include high rates of immigration, a rise in the savings rate, and t he expansion and improvement of the nation´s transportation and communications network.

letter d is correct.