When did economic expansion begin to take place ,and what were the results?

The economic expansion took place in the 1900s in the United States of America. The GDP of the country increased continuously for 10 years. The jobs were still less and it was observed that financial and service sectors boomed more than that of the manufacturers. In 1194, jobs were also created and this also led to further economic development. The amount of wealth generated was very high and poverty rates decreased.

The answer is c. good luck : )