Small multiples choropleth map. Color shows the annual percent change in the number of manufacturing jobs. Red is a decline, blue is growth.
Three recessions are covered in this timespan: July 1990 to March 1991, March 2001 to November 2001, and December 2007 to June 2009 (see NBER’s business cycle dates).
In a real world situation you wouldn’t want to have the user’s browser
do all the computation needed to draw these maps.
The maps are rendered in <canvas>
so it would be fairly straightforward to pre-render them as images
and to serve those instead.