Around the 14th century, the cities of Nanjing, Calicut, Mogadishu and Venice was significant because the major center's of trading activity flourished there.
This is correct.
Machiavelli was an Italian political philosopher whose famous work, the Prince, is an in-depth look at what is necessary for a ruler to be effective, both in terms of ruling a people but also in doing what needs to be done.
The Columbian Exchange lead to an increase in the demand for skilled labor in Europe, because D) an abundance of raw materials from the new world needed to be made into finished goods. Many raw materials and new products were brought over to Europe from the Americas which needed to be made into finished products.
i think the following answers are: Korea is still divided between a communist north and a democratic south
South Korea has become more prosperous because they have had trade and foreign aid from the United States and other countries.