Top Ancestry or Hispanic or Racial Subgroups for U.S. County Subs and Places

[King of Kensington]

though African-Americans' lack of choosing listed ancestries probably hurt their numbers in Brooklyn.

NYC's Black population is heavily Caribbean.

About half of NYC Black household heads are foreign born (see Table 1).

http://www.metropolitiques.eu/The-Evolution-of-New-York-City-s.html?lang=fr

There are probably a fair number of 2nd generation Caribbean Blacks in the "native" head of household category.  It wouldn't surprise me if more NYC blacks can trace their roots to the Caribbean than to the South at this point.

[King of Kensington]

This is fantastic.

[King of Kensington]

They need to replace 'American' with Scots-Irish, since that is the actual ancestry of respondents who choose that word. 

And most of these Scots-Irish have English ancestry too.  The so-called Celtic Thesis promoted by Jim Webb is nonsense. 

[King of Kensington]

Are Japanese in LA more business oriented. and wealthier, so they can live closer to the coast?

My guess is that they're more assimilated (Japanese Americans are the only Asian group that's majority American-born) and have residential patterns closer to whites in L.A.

Asians tend to live in newer suburbs further from the water.

[King of Kensington]

What about Jews?  They're a plurality in certain NYC suburbs, probably in Brooklyn and Manhattan too and various other places like Brookline and Newton outside Boston, in pockets in Broward and Palm Beach etc.   

[King of Kensington]

Looking around at some heavily Jewish suburbs of NYC:

Scarsdale

Russian  11.8%
Polish  8.4%
Eastern European  7.3%
Hungarian  1.8%
Romanian  1.6%
Austrian  1.5%

Millburn Township, NJ

Russian  11.3%
Polish  6.1%
Eastern European  4.9%
Austrian  2%

Town of North Hempstead

Polish  5.9%
Russian  5.6%
Iranian  4.3%
Eastern European  1.3%

It seems like unspecified "Eastern European" responses are mostly Jewish.   While most Polish Americans are not Jewish, I suspect most "Polish" responses in Jewish suburbs are Jews and not Polish Catholics.  Iranians in Long Island are mostly Persian Jews.

Since combining Russian and Eastern European wouldn't have any overlap, I wonder how much this would change the map.

[King of Kensington]

What does this map show?

I can't make out what it means.

[King of Kensington]

Russian + Eastern European is probably a pretty good proxy for Jewish in areas filled with 4th generation Reform Jews, though less so with less "mainstream" Jewish populations - ultra-Orthodox, Sephardic and so on.

In NYC, outside Manhattan I doubt a majority of Jews still have the "Ellis Island" immigration story.

[King of Kensington]

Hungarian ancestry is the most commonly reported European ancestry in (Hasidic) Borough Park and Williamsburg.