<span>C. The drought and ecological disaster of the central United States in the 1930s
The Dust Bowl describes the affect of a drought on the central americas, which led to plain fires, creation of deserts (as there was little water), as well as the effect it has on the crop market, the availablity of crops, as well as prices.
hope this helps</span>
The two types of farm owning developed slavery because the owners of them were allowed to have slaves. The encomienda system was based on the idea that conquerors should have slaves to work for them, and it similarly applied to sugar colonies that had slaves on them. They were responsible for a lot of trafficking of slaves from Africa.
Generally speaking, advanced farming techniques allowed for a surplus of food, which led to the emergence of a "artisan" class--since for the first time people were "freed" to engage in other actives besides gathering food.
A. because the ball won't stop! hopefully this helps!!