Ogalala and Cheyenne River Sioux Indians
The correct answer is a. crop prices went down.
Simple as that. When the prices fell down, people could produce more for the same amount of money as earlier, which led to a boom.
Greater need for protection. C) emergence of new social classes. Population growth and the domestication of plants and animals brought on new cultural changes, such as gender inequality, greater need for protection, and the emergence of new social classes.
Answer: Through trade with other countries
