Dallas County by largest group on every block, every census from 1940 to 2020. Built with Claude Code

I wanted to see how DFW changed over time demographically. I found some dot maps online with the 2010 and 2020 census data, but hardly anything older than that, so I asked Claude to build it. It took Claude about 8 prompts to make the final version you see here. It would have taken me weeks without Claude to make this. It pulled census data back to 1940 and typed up numbers from old printed census reports. It rebuilt the boundaries for each decade and used historical building footprints to figure out where people actually lived before there were block counts. The final project is a local app that runs offline on my Mac. It has Dallas, Tarrant, Collin and Denton counties, every census from 1940 to 2020 plus the latest survey data, and a dot view and a shaded view. The data was sourced from IPUMS NHGIS and the Census Bureau. Here's the Fort Worth version: https://www.reddit.com/r/FortWorth/comments/1wqupq1/fort_worth_inside_loop_820_every_census_from_1940/