Answer:
From 1865 to 1900, improvements and new technology such as the transcontinental railroad, refrigerated car, and the assembly line fostered great change in American industry.
Step-by-step explanation:
During this period, the economic change most fostered by the Civil War included (1) an end to slavery; (2) an increase in the need for cheap labor to work in the factories; and (3) an increase in railroad building.