Which was an advantage of railroads over canals, roads, and steamboats?

a) railroads were safer than other transportation.
b) railroads could move freight and passengers more quickly.
c) railroads did not need trained personal to operate them.
d) railroads were easier and less expensive to build.

nothing certain is known about what happened, but it seems that the country declined gradually, perhaps due to bad government, or, more likely, due to a series of bad harvests, which resulted in widespread and recurrent famine.

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