You are not very well read, are you? You wouldn't know treason if it bit your mentally deficient butt. Tell you what, Einstein.... I will pay you $50 if you can show me anywhere in the US Constitution as it existed in 1860 where secession was prohibited. As a matter of fact, genius, four of the original thirteen states included a written reservation of a right to withdraw from the Union at their own discretion in their ratification statements. Those states were NY, RI, VA, and SC. Below are the links to the word-for-word transcriptions. I doubt you have the education to look it up yourself.

https://avalon.law.yale.edu/18th_century/ratva.as
https://history.nycourts.gov/ratification-statement/
https://avalon.law.yale.edu/18th_century/ratri.asp
https://avalon.law.yale.edu/18th_century/ratsc.asp

In case you didn't notice, the source is Yale Law School. I realize that is not as authoritative as Salon or Raw Story or some other brainless Liberal rag, (at least in your eyes) but do try and keep up.

As for Robert E Lee and Stonewall Jackson, you appear to be clueless there, also. Not surprising. Robert E Lee never purchased a slave. The few he inherited he freed in accordance with the terms of the will which bequeathed them to him. Stonewall Jackson owned six slaves. Three he inherited, two he freed, and one child that was learning disabled whom no one wanted. He took the child in when no one else would.
There were four slave states that remained in the Union, home to some half million slaves. These slaves were ignored by the Emancipation Proclamation. Among them were the four owned by one Julia Dent Grant, wife to Ulysses of the same surname. Ever hear of him? Rather than free her slaves, Mrs Grant gave them to her father who lived nearby so she and the good general could benefit from their bondage while avoiding the sobriquet of slave owner.
Last but not least, you cannot commit treason against a foreign country. The slave states had seceded. There is nowhere in the Constitution that said they could not. Why did Robert E Lee petition to have his citizenship reinstated? If he was already a citizen, it was unnecessary, and if not, there was no treason. Lee resigned from the US Army before he was even offered a position with the Virginia militia.
I have tried to clarify this without using too many big words, since you may not have anyone available to explain them to you.

I graduated from Nathan Bedford Forest high school in Jacksonville Florida....Grew up on the westside back in the day when it was all Dairy's, ranches, scattered homes, Mom and Pop businesses. Spent many great summers fishing in the Ortega river down the street from my folks house.....how bout that Jacksonville coliseum, saw my first concert there..... the incomparable Alvin Lee and ten years after with Edgar Winters ..... Westside the best side....Small world. Excuse me for bending everyone's ears.....I just don't get it, statues of people who were historically significant won't hurt you. Of course if inanimate objects cause you large amounts of but hurt I must say....GOOD!!!!!! With all due respect of course....Aloha

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Whose statue are you referring to remove?

Congress must pass a law that prohibits the destruction of those historical statues. They were there because the people who set them up, wanted to emulate the greatness they have done and had far exceeded the negatives. Though nobody is perfect, they have also erred but that is part of human life. God knows it.

"To err is human to forgive is divine. "

With an exception. For a total transformation of government, the people want to remove the prior leaders who they believe did most evil, and had something to do with that cruel government.

E.g. Hitler of Germany; Linen or Stalin of Russia.