The system of mass production in manufacturing developed rapidly after the industrial revolution. during the gilded age. before the industrial revolution. after the gilded age.

During the gilded age

Explanation:

In 1870 and 1880, both the economy as a whole and wages, wealth, national product and capital in the United States grew at the fastest pace in the history of the country. As the industry grew, methods of mass production evolved. The Gilded Age of the second half of the XIX century became the epoch of magnates. The economy quickly evolved, and corporate incomes grew rapidly as well.

they remained in rural areas and worked at jobs such as lumbering or farming.

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