The population density is the quantification of the amount of people who live in a certain area. In units, it is the quantity of people per squared kilometre. Therefore, densily populated areas are those which have more people per km2.
There are two types of factors which determine the population density in an area:
Physical factors: like climate, available resources, or the relief.
Human factors: political and social conditions
If focusing on the factors abovementioned in the question:
Climate: areas with warm weather usually concentrate the largest world population shares. For example, it is possible to grow crops there. This is not the case in other places with extreme weather such as the North Pole or the Sahara Desert.
Resources: areas with resource availability such as energy sources (coal, oil), and other types of raw materials are more densely populated (US, Western Europe).
Answer: They wanted to punish the South, and to prevent the ruling class from continuing in power. They passed the Military Reconstruction Acts of 1867, which divided the South into five military districts and outlined how the new governments would be designed. I think-
