A choropleth map is a type of statistical thematic map which focuses on a specific subject, such as population, and uses different colors or patterns in order to reference specific categories of a specific theme. Usually the colors follow progressions, such as light to dark, in order to map quantitative data. For qualitative data, completely different colors may be utilized in order to highlight the distinctions. This particular map uses a light-to-dark color scheme in order to show Hispanic population densities in the US.
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