Shadrach McCants was born on 22 December 1880 in Spartanburg, South Carolina, a son of James Mccants and Susan Thompson. His death certificate states that he was "Negro" and worked as a hatter. 
Shadrach Mccants, age 22 and a native of Spartanburg, South Carolina , married Marion E. Bannister, age 21 and a native of Barbados, West Indies, in Manhattan, New York, on 18 December 1902. His parents were identified as James Mccants and Susan Thompson. Marion's parents were Christian Bannister and Josephine Manhall. 
Thomas McCants, an infant son of Shadrach T. McCants and (apparently) Marion, died in Manhattan, New York, on 2 March 1904, aged less than one year. His address was given as 138 W. Third Street. Burial was in Mt. Olivet Cemetery. The death record shows the child's mother's name as Susan Thompson, but this is presumably a mistake.
The 1905 New York State Census recorded Shedrach Cants Mc, age 24, and wife Marion Cants Mc, 23, on West 53rd Street in Manhattan. Shedrach was born in the United States and Marion was born in Barbados, West Indies. Shadrach worked as a bell-man. 
Shadrach T. McCants married Lola Bell Graham in Seattle, Washington, on 16 July 1918. Witnesses were Chas. G. Adams and Mlle. Irene Robinson. Some biographies give the date of this marriage as 1921, but that date is inconsistent with the marriage record. Jackson states that Lola's father officiated at the wedding in 1921.
Shadrach Thomas McCants registered for the World War I draft in Seattle, Washington, in September 1918. He reported that he was born in the United States on 22 December 1880, was 37 years old, and worked as a tailor "for self." He named Mrs. Lola B. McCants as his nearest relative, and reported that he and Lola both lived in the Alki Hotel at 5th and Wash. in Seattle. He was described as Negro, of medium height and build, with dark brown eyes and black hair. He signed his name "Shadrach Thomas McCants."
Shadrach and Lola McCants had a son in 1919 who was born premature and died at the age of 9 days.
The 1920 U.S. Census recorded 39-year-old Shardrach T. McCants and his wife, 23-year-old Lola G. McCants, on 23rd Avenue in Seattle, Washington. Both were described as mulatto. Shardrach was born in Ohio to a father born in Ohio and a mother born in North Carolina. He was a proprietor in the men's furnishings business and he owned their home.
Sons Robert and David were born in 1923 and 1925, respectively. The marriage of Shadrach and Lola ended after she filed for divorce in Portland, Oregon, in 1925.
The death of Shadrach Thamas Mccants, age 76 and divorced, was recorded in Seattle, Washington, on 25 July 1957. He resided at 210 23rd Avenue in Seattle and died at King County Hospital. He had lived in Seattle for 48 years. Burial was in Greenwood Cemetery, Renton, King County, Washington on July 29, 1957. The source for the information was from the records of King County Hospital.
↑ "New York, New York City Marriage Records, 1829-1940," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:243M-RYH : 10 February 2018), Shadrach Mccants and Marion Bannister, 18 Dec 1902; citing Marriage, Manhattan, New York, New York, United States, New York City Municipal Archives, New York; FHL microfilm 1,570,959. Certificate No. 24190. Also at Ancestry.com. New York, New York, Extracted Marriage Index, 1866-1937 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2014. Original data: Index to New York City Marriages, 1866-1937. Indices prepared by the Italian Genealogical Group and the German Genealogy Group, and used with permission of the New York City Department of Records/Municipal Archives.
↑ "New York, New York City Municipal Deaths, 1795-1949," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:2WX2-7KK : 10 February 2018), Shadrach T. Mc Cants in entry for Thomas Mc Cants, 02 Mar 1904; citing Death, Manhattan, New York, New York, United States, New York Municipal Archives, New York; FHL microfilm 1,323,043.
↑ New York State Archives; Albany, New York; State Population Census Schedules, 1905; Election District: A.D. 15 E.D. 22; City: Manhattan; County: New York; Page: 2. Accessed on Ancestry.com at https://www.ancestry.com/interactive/7364/004518311_00593. Note: Shadrack's name is transcribed by Ancestry as McShedrack Cants.
↑ Stabile, Carol A. "Graham, Shirley." The Broadcast 41: Women and the Anti-Communist Blacklist (website). Accessed at https://broadcast41.com/biography/graham-shirley on 13 August 2019. Content of the website apparently is derived from Stabile's book of the same name (London: Goldsmiths Press, 2018).
Shadrach Thamas McCants (1881-1957) on Find A Grave: Memorial #186580592 retrieved 13 August 2019. [No gravestone. No information about burial location. No sources.] (Suggestion to correct burial location has been submitted)
"Washington, County Marriages, 1855-2008," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKNY-BWYM : 24 September 2017), Shadrach T McCants and Lola Bell Graham, 16 Jul 1918, King, Washington, United States, Washington State Archives, Olympia; FamilySearch digital folder 004212120.
I figure that the way a man spelled his middle name in his signature is a better indicator of the spelling than a record entry typed by a clerk after his death. But is there some evidence for the unusual Thamas spelling other than the death certificate?