by Ben Blatt
"One of the most interesting data sets for aspiring mapmakers is the Census Bureau’s American Community Survey. Among other things, that survey includes a detailed look at the languages spoken in American homes. All the maps below are based on the responses to this survey. For instance, Mandarin, Cantonese, and other Chinese dialects are separated as different responses in the data and were treated as different languages when constructing these maps. If those languages had been grouped together, the marking of many states would change. In addition, Hawaiian is listed as a Pacific Island language, so following the ACS classifications, it was not included in the Native American languages map. "
Via Jim Lerman