Incorrect, your question assumes facts not in evidence. The Lincoln administration operated and built the first concentration camps in the United States, beginning in 1862.
Concentration camps are enclosures where people are forcibly concentrated to die.
Operated as concentration camps were Fort Delaware (Pea Patch Island, Delaware), Camp Douglas (Chicago, Illinois), Camp Butler (Springfield, Illinois), Camp Morton (Indianapolis, Indiana), Johnson's Island (Sandusky, Ohio), David's Island (New Rochelle, New York), Point Lookout, (Maryland), Rock Island (Illinois) and possibly others.
Constructed to be concentration camps were Elmira Prison (Elmira, New York) and Hart's Island (New York, New York).
One is tempted to make the argument that, "Well, these facilities were nothing more than POW camps for Confederate prisoners," but that would be incorrect. These concentration camps of the U.S. government held thousands of U.S. citizens as political prisoners, arrested and imprisoned indefinitely for alleged political offenses. This was possible only because Lincoln suspended the constitutional protection of habeas corpus for his own citizens.
[Perverse is Lincoln's argument that he was President of all of the United States, including the South. I wonder if he thought he was President of his political prisoners dying in his concentration camps.]
In fact the very last prisoners to be released were POLITICAL PRISONERS from Fort Lafayette NY in March 1866, almost a year after the war was over.
Grave marker No. 2532 at Elmira NY reads, "A.S. Colton, Citizen."