Final answer:
The concluding section effectively emphasizes the significance of slavery to the Southern economy and the importance of cotton production.
Step-by-step explanation:
The concluding section, 'Cotton And Slavery Were Essential To The South,' is effective at closing the topic of slavery and cotton in America's early economy because it highlights the significance of slavery to the Southern economy. The section explains how the Southern states relied on slavery to cultivate and produce crops like cotton, which was the foundation of their economy. It also emphasizes the strong connection between cotton and slavery, as well as the economic and cultural impact of cotton production in the South.