Final answer:
Louisiana's antebellum economy was characterized by its vital port in New Orleans, which was a major hub for exporting cotton to international markets, particularly Great Britain. The correct option is D.
Step-by-step explanation:
Based on Source 1 and Source 4, the statement that best describes Louisiana’s economy during the antebellum period is that Louisiana had one of the most important ports in the United States for the export of goods.
During the antebellum period, Louisiana, and particularly New Orleans, became central to the cotton trade. With its strategic location near the mouth of the Mississippi River and as a hub for steamboat traffic, New Orleans saw a vast amount of the cotton produced in the South passing through its port destined for international markets, especially Great Britain.
Additionally, by 1840, New Orleans held 12 percent of the nation's total banking capital, underscoring its economic significance.