Answer:
There are several factors that transformed the US economy in the 19th century:
- Acquisition of new territories, westward expansion and access to new resources;
- the construction of railroad networks from the East Coast to the West Coast that allowed fast transportation of goods;
- invention of new devices and products that had massive demand;
- increasing use of machines that replaced hand labor and large scale manufacturing which accelerated after the Civil War;
- credit facilities by investors and bankers for businesses;
- growing urbanization and rural migration to the large cities.
Step-by-step explanation: