This example visualizes U.S. county-level population estimates by race and Hispanic origin using a dot density renderer. Each dot represents 100 people, with colors distinguishing eight racial and ethnic categories, overlaid on an interactive ArcGIS map. The visualization uses ArcGIS API 4.15 for mapping, FeatureLayer, DotDensityRenderer, and widgets like Legend and BasemapGallery, while D3 v5 is loaded for supplementary functionality. Data comes from the ACS (American Community Survey) feature service, with popups showing detailed counts per county and zoom constraints limiting display.