D3.js, or Data-Driven Documents, version 4.0 was released a few months ago, so Jim Vallandingham updated his tutorial for categorized bubble charts to use the new version of the library. I’ve been slow getting to the new d3.js, but maybe this’ll move things along.
Floaty bubble charts with d3.js
Reviving the Statistical Atlas of the United States with New Data
Due to budget cuts, there is no plan for an updated atlas. So I recreated the original 1870 Atlas using today’s publicly available data.