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There may be more non-European blood, on average, from "Old World" sources than new world contact (i.e. West/Central Asian, North African).
There was some intermarriage in the early colonial period, so trace amounts are not rare, but it is very faint for most.
The exceptions may be where there are long-term contacts between European American settlers and groups such as Hispano New Mexicans in and around New Mexico, Colorado, etc, or maybe French colonial areas. Some French Canadians, Cajuns are likely to have some Native American lines.
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