<span>If I am right I think it is going to be cuba</span>
The reason they went to war is when the Athens interfered in Persian affairs.
Railroads made transportation of materials, supplies, etc much faster and easier.
Canals (such as the panama canal) helped make water transportation easier and quicker.
Roads made everyday travel easier
I think the answer is d. The slave owners could keep the slaves working in the field by turning them in because they were jobless. It was illegal back them to be jobless. The thirteenth amendment said you could not be a slave unless you were a prisoner.
If you need more help look up thirteenth amendment