Ethnicity map of the United States

To celebrate the nation's 250th birthday, the New York Times has created an impressive interactive map depicting the self-reported ethnicity of U.S. citizens as they recorded such in 2019-2024 U.S. Census.  Responses rhat included a race but not a specific origin group are not included.

In the interactive map, you can zoom in to drill down to specific subregions, apparently defined by census data rather than county borders:

And there is a map from the time of colonization: