This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
unitedstatespopulationdensity.svg en map of the population density of the United States down to county level based on Census data County shapefiles provided by Census TIGER Shapefiles Other shapefiles provided by Natural Earth own Crimsonedge other fields QGIS Maps cczero Uploaded with Population density maps of the United States