Univariate choropleth maps are maps that only display data about one variable. The variable is expressed with colors or symbols in which case the color can vary in shades due to an increase or decrease in its value. In this map the areal data is divided by county areas. Only hues of blue are used in this map but null values and overlapping can occur which "mixes" colors. I am not sure what this map is displaying but it is using shades of blue to depict percent population in relation to another property such as ethnicity, age, or gender. I believe dark areas and "white" areas are values of either 0% or 100%, respectively.
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