Final answer:
The rail line was the innovation that helped Northerners transport goods in the 1800s.
Step-by-step explanation:
The innovation that helped the Northerners transport their goods to customers in the 1800s was the rail line. Railroads were a major development during this period as they provided a faster and more efficient means of transportation compared to other options like ferries, automobiles, or pump cars. The rail line allowed for the movement of large quantities of goods over long distances, connecting different regions and markets.
Learn more about Transportation in the 1800s