Why wasn't ONE southerner tried for treason? Col. Wirz was tried for conspiracy and murder, not teason.
‘Why wasn’t ONE southerner tried for treason?’
Actually quite a few southerners were tried for treason. The irregular pro-Union troops from non-slaveholoding regions of the South, e.g. the ‘Taylor County Rangers’ of Perry. FL, when captured, were tried for treason to their confederate state governments and hanged.