Which statement best describes a major cause of the economic transformation the United States experienced in the early nineteenth century? A. Scientific advances in agricultural pest control led to larger crop yields. B. A decrease in immigration to America forced manufacturers to figure out how to automate factories.. C. The invention of new methods of transportation made it cheaper to ship freight.

Which statement best describes a major cause of the economic transformation the United States experienced in the early nineteenth century? A. Scientific advances in agricultural pest control led to larger crop yields. B. A decrease in immigration to America forced manufacturers to figure out how to automate factories.. C. The invention of new methods of transportation made it cheaper to ship freight.