Missouri, U.S., Federal Naturalization Records, 1856-1942 [database on-line]. Ancestry.com, Lehi, Utah, USA citing National Archives at Kansas City; Kansas City, Missouri; ARC Title: Declarations of Intention for Citizenship, 1890 - 1/25/1991; NAI Number: 784139; Record Group Title: Records of District Courts of the United States, 1685-2009; Record Group Number: RG 21. Samuel George Ritchie, Declaration Number 6218, Eastern District of Missouri. Born Ballymena, Ireland 31 Aug 1888. Arrived aboard Columbia New York 23 Jun 1910 from Londonderry, Ireland.
"United States World War I Draft Registration Cards, 1917-1918", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K3RY-FY6 : 23 August 2019), Samuel G Ritchie, 1917-1918. Born Ballymena, Ireland, 31 Aug 1888. Served 2 1/2 years non-commissioned in the Royal Navy.
"United States Census, 1920," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:M8Z2-54L : accessed 3 January 2021), S G Ritchie, St Louis, Missouri, United States; citing ED 198, sheet 2A, line 30, family 44, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 954; FHL microfilm 1,820,954. Born Ireland 1889. Immigration 1891. Both parents born Scotland.