40 Martin Van Buren was entirely of Dutch descent, without “a single intermarriage with one of different extraction from the time of arrival of the first emigrant to that of the marriage of my eldest son, embracing a period of over two centuries and including six generations” (Autobiography (ed. J. C. Fitzpatrick, Washington, 1920), 8).
   John F. Kennedy was completely Irish Catholic; his great grandfather, Patrick Kennedy, came from County Wexford, ca. 1848-50.