These were expensive to build and maintain so they looked for better and cheaper ways to move goods and people? A: canals
B: roads
C: railroads
D: planes

- "made the south's economy grow rapidly and a small effect that a lot of people don't know is that it made the more demand of slaves and cotton products. and also new states formed due to plantations growing in size."

< 3

the awenser wuold be slaves