Makefile modeled after the U.S. Atlas project.
Updated to use 2019 shapes and a bit less simplification – Curran January 2021.
Also demographic data from the US Census populates demographics.json.
That file can be fetched with the following command:
wget -O demographics.json "https://api.census.gov/data/2019/acs/acs5?get=B02001_002E,B02001_003E,B02001_004E,B02001_005E,B02001_006E,B02001_007E&for=tract:*&in=state:36"