The efficiency and productiveness of many large cotton plantations found in the south during the first half of the 19th century made most plantation owners economically dependent on

Large amounts of labor. This labor was acquired by purchasing slaves to work the plantations. This made most plantation owners economically dependent on the slave trade.

Labors (slave)

Explanation:

The Southern states in the first half of the 19th century depended on the labors to perform work in the fields of cotton plantations. The labors were the African American who were brought from Africa and put into auctions to sell. For the plantation owners, slavery was the backbone of the economy of the South. Slaves were forced to work in the fields of cotton from sun up to fall. They helped the South in getting rich and prosper.        

- "the past is made of multitudinous items ranging from anything that can be collected, recollected or assessed to originate in the past. as such, the past is a gallimaufry of particulars that may not have been related in any way. however, the human mind seeks organization to understand concepts and other things. the human mind therefore seeks relationships in explaining and studying the past. history being a humanity, dictates that historians have to serve this human trait by bringing structure to details of the past. historians do this by creating interpretive frameworks that capture as many details as possible."

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answer-the island had airfields that the u.s. military needed.