I've been working a bit with open data associated with congressional districts, and I'd like to do a visualization of boundary changes over time. There may be s

I've been working a bit with open data associated with congressional districts, and I'd like to do a visualization of boundary changes over time. There may be some interesting data features associated with places that have been subject to frequent redistricting. https://www.census.gov/geo/maps-data/data/tiger-line.html https://www.census.gov/geo/maps-data/data/tiger-line.html ftp://ftp2.census.gov/geo/tiger/TIGER2016/CD/