After emigrating from Ireland in 1890, he came a naturalized citizen of the United States on the 23rd September 1919.
↑ General Record Office, Ireland. Civil registration of a birth. Oliver Pringle, male, born 17th June 1870, at Saloo; father: Oliver Pringle, gentleman, Saloo; mother: Elizabeth Pringle formerly Birney; informant: Oliver Pringle, father, Saloo; registered 6th July 1870; H. Woods, registrar. Digital image online at Irish Genealogy, hosted by the Department of Culture, Heritage, and the Gaeltacht, www.civilrecords.irishgenealogy.ie (accessed by Alison Kilpatrick, 2018-01-28).
↑U.S. Naturalization Record Indexes, 1791-1992. Oliver Pringle, born 17 June 1870 in Ireland, naturalized 23rd September 1919, cert. no. P-29212. Original record: National Archives and Records Administration (NARA); Washington, D.C.; Soundex Index to Naturalization Petitions for the United States District and Circuit Courts, Northern District of Illinois and Immigration and Naturalization Service District 9, 1840-1950 (M1285); Microfilm Serial: M1285; Microfilm Roll: 142. Digital image and index online at ancestry.ca (accessed by Alison Kilpatrick 2018-01-30, by subscription).