The South didn't see a problem in almost everyone growing the same few cash crops. They were in high demand, especially cotton. They were all making good money. The idea to diversify seemed silly and dangerous. Here was something that was working and making them more than enough. To stop and venture into something different would be expensive and possibly fail.
The slave trade played a major role in helping Europeans take control of much of Africa in the 1800s, since this allowed them to do business with local slave dealers and form alliances that kept them safe.
Out of the choices given, the top 3 nations receiving remittances in 2004 were India, China, and Mexico.