During the Industrial Revolution, transportation in the US improved greatly, mostly with the expansion of railroads. The major advantage of this was that people and goods could get from place to place more easily. This created a national market where something could be produced in one part of the country and consumed in any other part. This helped the US economy boom.
The major disadvantage of the improved transportation was felt by smaller groups of people. The Native Americans were hurt by it as it brought settlers into their lands. Many farmers were hurt by railroads because the railroads had enough economic power to charge the farmers very high prices for hauling their products to market.