Final answer:
The American economy nearly doubled in size from 1877 to 1897 due to factors such as industrialization, urbanization, and immigration.
Step-by-step explanation:
The American economy nearly doubled in size from 1877 to 1897. During this period, the United States experienced significant economic growth driven by factors such as the rapid industrialization, urbanization, and immigration. The expansion of industries like manufacturing and the construction of railroads contributed to the overall growth of the economy.