Ethnic homogeneity and population density are the two factors.
Homogeneous societies are societies in which all individuals share the same ethnicity, language, and set of beliefs. It is a society where members share culture, customs and ways of thinking.
Population density is a measure of population per unit area, or exceptionally population per unit volume. The amount of mold number density. It generally applies to living things, mainly humans. This is an important geographic term.
Population density allows a wide range of resident intensities across geographic areas. In the United States, population density is usually expressed as the number of people per square mile of land area.
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