No, they weren't. If they were, where was the trial? Other than the hanging of Wirtz, over Andersonville, you can't produce the name of a single general or field-grade officer of the CSA who was tried for treason. The U. S. Government held Jefferson Davis for years and didn't try him.
Your saying it doesn't make it so. The Confederates changed their allegiance openly and supported their People in what they wanted to do, which was to leave the Union and found a new republic. That isn't treason, and neither is levying war against the United States treason, for anyone who has openly renounced United States citizenship and declared for another sovereign -- or for no sovereign. These people were citizens of another country, and not citizens of the United States. The partisan and clearly expedient declarations and decrees of the United States Government and its courts to the contrary notwithstanding.
They were given pardons and amnesty. For the most part, they accepted such. For those who did not, there were the disabilities of the 14th Amendment. A number of former confederates repented for their crimes and became again worthy American citizens, in the fullest sense.
They were given pardons and amnesty. For the most part, they accepted such. For those who did not, there were the disabilities of the 14th Amendment. A number of former confederates repented for their crimes and became again worthy American citizens, in the fullest sense.
"These people were citizens of another country, and not citizens of the United States."
You can certainly renounce your citizenship, if you wish. You just can't steal the the loyal citizens' country away from them.