American ancestors and cousins of the Princess of Wales

the long version

"Almost since first hearing of Lady Diana Spencer ... many Americans have been aware that the Princess of Wales has genealogical links to this country ... the Princess [is] one-eighth (or more properly, three-sixteenths) American, the granddaughter of a Harvard graduate and U.S. Army captain during World War I ... she also has ancestors who lived in six of the original thirteen colonies ... and probably between twenty and thirty million living distant American cousins.".