Final answer:
The development of transportation systems increased accessibility to markets and decreased costs of raw materials and goods.
Step-by-step explanation:
The main impact of the development of canals, roads, and railroads on the American Industrial Revolution was that it increased accessibility to markets and decreased costs of raw materials and goods.
With the construction of canals, roads, and railroads, it became easier for goods to be transported to different parts of the country. This allowed industries to access larger markets and sell their products more efficiently, leading to increased industrialization. Additionally, the transportation systems reduced transportation costs, making it cheaper to obtain raw materials and distribute finished goods.
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