Giving them troupes amok gums and etc.
I had to look for the options and here is my answer:
Most scientists conclude that it is the increasing global temperature that leads to the increasing levels of carbon dioxide in the Earth's atmosphere. This may be due to the different chemicals that are being emitted in the air. Hope this helps.
Slavery for sure. I believe the second one is economic differences between the North and the South.
They had extensive exports that other nations depended on.
In the sixteenth century, the economy of the Ming dynasty was stimulated by maritime transport with Portuguese, Spanish and Dutch. China, then, became involved in a new world of goods, plants, animals and crops fed as the Colombian exchange. Major European and Japanese companies bought large quantities of silver, which then replaced copper and paper notes as a major trading currency in China.
