Answer:
A system of canals and roads linking the Atlantic coast states and the trans-Appalachian west, is the right answer.
Step-by-step explanation:
The Market Revolution that took place in the United States during the 19th century was a drastic transformation in the system of manual-labor dawning in the South (and promptly driving to the North) and later expanding to the other parts of the world. During this time, traditional commerce became outdated with the advancement in various industries such as transportation, communication, and industry. However, it may be said that the construction of the system of canals and roads joining the Atlantic coast states and the trans-Appalachian west was the most crucial factors which led to the Market Revolution.