I developed this map when I was tinkering around with the US Census API while doing research for another project.
The simple map interface was written using Leflet.js and is pulling the County boudaries as geojson from the US Census Tiger Web ArcGIS REST interface. The population and poverty data for a selected county is queried using the US Census ACS API and SAIPE API. The Drug Poisoning Mortality data is being queried from Centers for Disease Control and Prevention web API. This map is inteded to be used for demonstration purposes only. I've seen some pesky issues when using MS Edge which I don't intend to debug.