How did his trial for Treason turn out? For that matter, how did any treason trial for a Confederate during that era turn out?
Once a state seceded, the citizens of a State were no longer US citizens. The President of the Confederacy was never tried or convicted of Treason either. Robert E Lee's country was the Confederate States of America.
Being repeated often doesn't infer truth.
Confederates weren’t tried for treason because it would not have helped anything.
The U.S. did not want to enact vengeance.
It was a good decision.
Re Davis, the great Jimmy Carter restored his citizenship poshumously in 1978.
“In posthumously restoring the full rights of citizenship to Jefferson Davis, the Congress officially completes the long process of reconciliation that has reunited our people following the tragic conflict between the States,” the resolution read on October 17, 1978.
Interesting how today the leftists ignore this reconciliation.
Lee also died having lost his U.S. citizenship, it being restored after his death in 1976.