US Census data is good for more than just tracing individuals through our histories. That census data is also aggregated into bigger picture sets that can tell us many things, and is used by our government to allocate resources.
This link takes us to a page where the reported ethnicity of the population of the United States is mapped out at the county level, for every state in the union as of the 2000 Census. I find it fascinating to see where groups of people settled, and how that has played out over our country's history.
UPDATE: Due to a quirk of Blogger's publishing code, this article got released prematurely. Sorry!
This and all other articles on this blog are © copyright 2013 by Daniel G. Dillman