Respuesta :

Steamboats Steamboats positively effected the world because they made the transportation of goods more efficient and economical. Travel time was cut in half and were a compliment of the railroads, both for commercial and passenger transportation. Steamboats were independent on the wind speed and direction.

Negative effects were the pollution of burning wood and coal. 

The correct answer is C. people began to build canals in the United States and Europe.