Maps of European American ancestries

These maps show the population concentrations of national extractions in the US. You see the concentrations of Germans in the Midwest. Based on 2000 U.S. Census. (Sorry I can't find the key but dark red indicates higher density, then red, then orange, then yellow, then white).

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German ancestry:



Compare to this map of Italian ancestry and you'll see high percentage of German ancestry all over the USA.

Italian Ancestry:

Rank	Ancestry	Number	Percent of total population
1	German	42,841,569	15.2%
2	Irish	30,524,799	10.8%
3	African	24,903,412	8.8%
4	English	24,509,692	8.7%
5	American	20,188,305	7.2%
6	Mexican	18,382,291	6.5%
7	Italian	15,638,348	5.6%
8	Polish	8,977,235	3.2%
9	French	8,309,666	3.0%
10	American Indian	7,876,568	2.8%
11	Scottish	4,890,581	1.7%
12	Dutch	4,541,770	1.6%
13	Norwegian	4,477,725	1.6%
14	Scotch-Irish	4,319,232	1.5%
15	Chinese	4,010,114	1.4%

This one is even more revealing:

Plurality ancestry in each state, ranging from 11.8% (FL) to 43.9% (ND).     German      American      Mexican      Irish      African      Italian      English

     Japanese      Puerto Rican

This means, I believe, that the state is colored to indicate the largest national group. For most of the country it is German.

Source: Wikipedia