Which of the following WAS NOT a reason for the world wide depression?

Throughout united states history, new groups of people have been given voting rights. this usually occurs through

The controlled use of fire by hominids: (a) limited the expansion of hominids into certain environments, such as dry grasslands. (b) decreased the amount of food energy available in the hominid diet. (c) contributed to geographical expansion and food production techniques in positive ways. (d) has been shown to contribute little to the digestive process of hominids.

What trade did europeans want most before the 1800s ivory wood slaves gold