These states run a huge expenditures in their efforts to rebuild. This involved large gov projects that yielded little return value
The answer is Mathematics
During the antebellum era, both the North and the South have been producing cotton and textiles. However, because the North has far more advantages than the south in terms of technological advancements, the North was able to produce more products by the end of the era such as guns, crops, machine parts and more.
Tropical rainforest, the high mountains and wild rivers were some of the physical obstacles that the Incas faced. They had to build a complex network of roads to link the entire Inca empire. They had messenger stations along these roads so that they could relay their messages, and they built shelters along the way for travelers.
