Just as I thought. Look at where the "Americans" are located. These are my people! We have no idea who our daddy is, therefore, we are AMERICANS DAMIT!
i think in the censuses , when people cannot root back to their origin, they are allowed to check the box for American.
You're over thinking this Schultz. They look at that box and say, "What da hell you mean man, shit weez 'Mericans!"
Well, Phil certainly didn't look at the actual form I posted a link to and he is responsible for the map, so there you have it. I say give that man citizenship.
From looking at the map the two counties in central Iowa that show a majority of Dutch ancestry is correct. No idea on the NW county.