Have you seen http://dsl.richmond.edu/panorama/foreignborn/#decade=1850 http://dsl.richmond.edu/panorama/foreignborn/#decade=1850 ? I starts 30 years later but

Have you seen http://dsl.richmond.edu/panorama/foreignborn/#decade=1850 http://dsl.richmond.edu/panorama/foreignborn/#decade=1850 ? I starts 30 years later but has data on county level. https://github.com/americanpanorama/panorama-foreignborn https://github.com/americanpanorama/panorama-foreignborn