The Constitution doesnt NEED to 'allow' secession - the more important fact is that it doesn't PROHIBIT secession. Given that, the states reserve the right, as per Amendment X.
What??
So you are not going to even adhere to a standard you set up for me?
-YOU- set up the standard for you, by arguing that the Constitution prohibits secession, et al. Nothing you have posted thus far in any way supports this assertion.
MY argument is centered around Amendment X, which notes that in order for a state to not retain a right - in this case, the right to leave the union, said right must be prohibited by the Constitution.
The constitution contains no such prohibition, and as such, the right to seceed is retained by the state.
Disagree? Cite the constitution, and be prepared to show how what you cite actually does what you say it does.