answer is lol and we can hangout like tom 4 pm
Because it was harder to travel over moountains.
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.
One of the primary consequences of the railroad in the United States was the creation of a system by which goods could easily be moved east to west, opening new sections up that were previously only accessible by horse or on foot.