Some things Andrew Jackson did to impact the economy in America is in 1833, Jackson retaliated against the bank by removing federal government placed money in state banks or as he said “pets.”As federal income from land sales fly, Andrew Jackson saw the time to fulfill his dream of paying off the national debt and make it possible which he did in early 1835.
I think it's because slavery costs less...just a guess.
The primary effect of cultural exchange between Europe and the Islamic world was that Muslim goods and knowledge led to some advancements in European society. One advancement example is the number system.