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AAnaMal08
Last edited Feb 4, 2018
Created on Feb 4, 2018

This example displays a choropleth map of the United States, rendering counties and states as colored vector paths. The visualization shows the geographic boundaries of counties, states, and the national outline using a green fill for county areas. Built with D3 v4 and the topojson-client library, it loads US Atlas TopoJSON data and applies projection with `d3.geoPath`. The code distinguishes regions by filtering counties into their respective states and traces state and national borders with distinct stroke widths.

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