Southern states were known as the cotton kingdom because the cotton population in the south was rapidly growing. Rich plantation owners would grow cotton and sell them to the New England region to make clothes etc.
Answer: Social epidemiology is the study of the causes and distribution of diseases.
Explanation: Social epidemiology studies which are the determinants of health and diseases in the world.<u> This discipline focuses on the role that social structures play in the health of individuals and populations</u>, that is to say<u> it studies how social conditions affect health levels and attract diseases. </u>Therefore, social epidemiology establishes a relationship between the distribution of social advantages and disadvantages and the distribution of health and disease.
The answer is D because answers A, B, and C are simply spreading American culture throughout America, thats not cultural diffusion by any means.
John Smith became the leader of the Jamestown Colony because he wants to help the colony survive and grow.