Answer:
the southern colonies had more slave labor because of cash crops
New scientific knowledge help the building of the Panama canal because there was a decrease of workers getting sick of malaria and yellow fever. It was Colonel Gorgas, the Chief Medical Officer, who have read about discoveries linking mosquitoes and malaria. Due to these readings, he succeed in eradicating the cause of the disease therefore a decrease in people getting sick.
New Orleans was at the time one of the biggest ports of slave trading. This allowed the US to trade goods and sell. This made it necessary to attain it
