What is the mean IQ of whites who say their ethnicity is "American only"?

Based on the General Social Survey, if you ask Americans where their families originally came from, they will typically give you an answer. But about 1% of whites and 13% of blacks will tell you they are "American only." 54% of whites who give this answer live in the South, and Americans of Scots-Irish ancestry are known to sometimes give this answer. By contrast, "American only" blacks are concentrated in the mid-Atlantic and East North Central regions. 

And their mean IQs? 

 

  

Wow, it's around 90 for whites. That is low. 

I wouldn't generalize these findings to the Scots-Irish. Many of the whites, and perhaps some from other races, who say "American only" are probably from lower IQ families who simply have not kept track of where their people are from. Or lower IQ people might be more likely to prioritize their American identity.