Question

The completion of the Erie Canal in the early 19th century aided the economic development of the United States by

Answer 1

Answer:

The completion of the Erie Canal in the early 19th century aided the economic development of the United States by making  possible to transport manufactured goods that were being moved in New York Harbor, as well as to export grain, salt, and wood from the Canadian border along the Great Lakes to the world.

Explanation:

   The Erie Canal is the link between New York and the Great Lakes, the main work of the canal fever period.

    The Erie Canal was the largest work of American engineering during the first half of the nineteenth century, completing the link between the Great Lakes and Canada with the emerging city of New York, the nation's new economic center, and the important state of New York. through its capital Albany, already on the navigable Hudson River.

    The Erie Canal has replaced old land routes and cut transport freight in its catchment area by up to 90% and reduced the delivery time of uncertain weeks for daily scheduling, which has enabled the region's major economic development.

Answer 2

I believe the correct answer would be by lowering the costs of shipped goods from the Midwest to Atlantic coast.
Hope it helps!