Counties and districts drawn

5,188 COUNTIES OF THE UNITED STATES shown in QGIS

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Citations

Redistricting procedure by state

https://ballotpedia.org/State-by-state_redistricting_procedures

Shapefiles of district maps of the United State Congress

http://cdmaps.polisci.ucla.edu/

Copyright (c) 2013-2018 Jeffrey B. Lewis

Shapefiles of United States counties

https://www.census.gov/geographies/mapping-files/time-series/geo/carto-boundary-file.html

2018 Congressional Election Results

Pettigrew, Stephen, 2018, "national-files.zip", November 2018 general election results (county-level), https://doi.org/10.7910/DVN/UYSHST/0UQP48, Harvard Dataverse, V4