Sure it was. Read the Constitution.
And you can't, because it doesn't. There is no supporting documents for this claim, but there are supporting documents to prove the contrary
There is also nothing to support that secession as practiced by the Southern states was constitutional either. No matter what you may think.
The Declaration of Independence clearly makes their position the default reality at that time. The "assumption" is that a nation founded on the right to independence could deny states that right by claiming the constitution forbids it.
Well they weren't ratifying the Declaration of Independence, were they? They were ratifying the Constitution and agreeing to abide by its provisions.
Sure it was. Read the Constitution.
Constitution didn't go into effect until 1789 dear. How was it infringing the powers of sovereign states before it was even passed?
There is also nothing to support that secession as practiced by the Southern states was constitutional either.
You are a slow student. Yes, in fact there *IS* evidence to support that secession "as practiced by the Southern states" was constitutional. I've already told you, but since your attention span seems to be childishly short, I'll remind you again.
1. Declaration of Independence asserts that people have a right under the laws of God to "dissolve the political bonds" between themselves and another people. This God given right established the legitimacy of the USA.
2. New York ratification statement asserts the right to reassume powers given up.
3. Virginia ratification statement asserts the right to reassume the powers given up.
4. Delaware ratification statement asserts the right to reassume the powers given up.
5. During the Hartford convention, (1814) Massachusetts asserted that it had a right to secede.
6. During the Hartford convention, (1814) Connecticut asserted that it had a right to secede.
7. No mention in the text of the US Constitution that states cannot leave.
The weight of evidence is against your claim that states didn't have a right to leave. What evidence do you have to show that the constitution forbade it?
Perhaps a "LOL!" will get you out of this awkward question.