1.  The John CORBIN in that 1880 census record is John H. CORBIN, not John N. CORBIN, as a careful reading will reveal.  Specifically, he's John Henry CORBIN, age 23 (b. 1856 — note age difference from our subject), son of John Newton's brother, Benjamin Joseph CORBIN.

2.  The wife of John H. CORBIN in that same 1880 census record is not, "Amanda," but "Arminda," as a careful reading will reveal.  Specifically, she's Ara Arminda (nee KING) who married John Henry CORBIN in Pickens Co., GA, on 15 Aug 1875.

3.  I have yet to find a record for the alleged marriage to Amanda THOMAS/THOMPSON, nor have I found them in any census record.

This confusion began with a mis-reading of the 1880 census and appears to have been promulgated, either innocently or deliberately, to obscure that fact that Amanda CORBIN, sister of the above John Henry CORBIN, appears to have been an unwed mother.  That is, when she turns up in the 1900 census as Amanda CORBIN, with six children, the assumption/goal was to make her a CORBIN widow, not an unwed CORBIN mother — hence the alleged late husband, "John CORBIN" — but records support the latter, as does the DNA evidence.  Y-DNA testing has determined that a son of Amanda's son, John A. CORBIN, is not a CORBIN (please see her page and his for further discussion).

1.  LDS.  Family Search: Internet Genealogy Service: IGI - International Genealogical Index (online at FamilySearch.org).

John Newton CORBIN Birth: About 1848, Cherokee, Georgia Death: 1865, Civil War, USA Father: John CORBIN; Mother: Delila Sylva WHITMIRE Source: patron submission

John Newton CORBIN Birth: About 1846, Cherokee, Georgia; Death: 1865 Father: John CORBIN; Mother: Delilah Sarah WHITMIRE Source: patron submission

2.  Anon.  1997-2000.  Military Records of Individual Civil War Soldiers.  Historical Data Systems, Provo, UT (online at Ancestry.com):

Name:	J. N. CORBIN
Residence:	Pickens County, Georgia
Enlistment Date:	01 January 1864
Side Served:	Confederacy
State Served:	Georgia
Service Record:	Enlisted as a Private on 01 January 1864. Enlisted in Company E, 23rd Infantry Regiment Georgia on 01 January 1864. In arrest on 30 Apr 1864.

3.  Confederate Soldiers from Pickens County:  Company E [Capt. Samuel TATE], 23d Regiment, Georgia Volunteer Infantry (online at genealogytrails.com; extracted from Tate's History of Pickens County):  Lists J.N. CORBIN among the Privates, along with Benjamin CORBIN and Joseph CORBIN, who are presumably John's older brothers (q.v.).

4.  William C. [Clyde] Whitten.  1988.  Peter Corbin of Pendleton, SC, District, and descendants.  Self-published, Clemson, SC.  I have not seen this source, but William M. CORBIN, in a message to the CORBIN Mailing List (Archive online at RootsWeb.com), indicates that, on p. 91, it says,

"John Newton Corbin b. ca. 1846, probably in Charokee Co., Ga, died in 1865 in War between the States."

No source is given.

5.  Email from William M. "Bill" CORBIN, who has extensively researched this family, including our subject, states that 1) he has found no Civil War records indicating John died in the war, and 2) has found deeds indicating he was still alive as late as 1878.