A new concept that became popular with department stores was using credit cards, and buying on credit: it allowed the users t posses good they cannot afford and on the other hand gave more revenue to the shops and they could charge interest.
Answer:
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It was the first American university created by a state government.
"Lucrative cash crops" is the best option from the list, but it should be noted that conditions for the workers, who were almost all slaves, were quite bad and dangerous.