British-Americans?
I think George Washington and John Adams settled that they were not British citizens, but American citizens.
and as far as the Crown was concerned, the rebels were traitors. Some were hanged as such. you would need to say the rebels lost the war and their like minded folk were flying an American rebel flag in order to make a fair comparison. but keep trying. I'm sure you'll fall upon something -- sooner than later.
I see the dopes from the USMB peanut gallery have thanked you.
The same government that was born from the declaration:
"That whenever any Form of Government becomes destructive of these ends, it is the Right of the People to alter or to abolish it, and to institute new Government, laying its foundation on such principles and organizing its powers in such form, as to them shall seem most likely to effect their Safety and Happiness."
Less than 100 years later made the case, through war, that the right of the people to institute new government did not exist.
So you see, if those who fly Confederate flags are traitors then the only logical conclusion is that anybody flying Old Glory is also a traitor.
sigh
spare me the declaration nonsense, and your premise concerning the American Civil War is flawed. You are hiding the arguments of some of the states behind 'The right of the people' -- of the United States of America. Using your flawed logic, the founding fathers believed anyone could opt out at any time.
now, before we get too far

this early on...
here is the OP
Americans killed in a single day: Al-Qaeda vs Confederacy
Guess who cased the death of 7,000 Americans in a single day -- in no less than 20 minutes? Yep you guessed it right, the Confederacy. Yet we still have traitorous Americans proudly flying the Confederate Flag.
I went down south and saw all those forts, and statues celebrating the Confederacy. I wonder, will Al-Qaeda be celebrated? Maybe not, they only killed 3,000 people, not all Americans and it took a lot longer than 20 minutes.
The British did indeed consider the rebels traitors and so did many of the colonists who were tories. As a matter of fact, the founding fathers knew they were committing treason. Their acts, like those of Benedict Arnold, went from disagreements to outright treason. And in both cases I understand the arguments.
You cannot credibly compare cases like you have attempted to do on 2 occasions unless you ignore the basic premises. You are making up your own argument and trying to say it is mine.
Americans who fly the Confederate Flag, are using a symbol of an enemy within, of the United States of America.