The transportation that had the greatest long-term impact on the American economy was the steam locomotive. Thus, option 4th is correct.
Cities grew along railroads and canals because settlers could obtain cheap land nearby. Thus, option 3rd is correct.
What is railroad?
Railroad refers to the road which has the rail lines linked to ties and laid on a roadbed that serves as a track for vehicles pulled by locomotives or propelled by independent motors.
The steam locomotive was the mode of transportation that had the biggest long-term effects on the American economy. Cities expanded along railroads and canals because nearby cheap land was available to settlers.
Therefore, it can be concluded that that option 4th and 3rd are correct for first and second part of the questions respectively.
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