Reading about the non-governmental organizations in support of the Texas secession movement, I've started to think if there were any States where such movements achieved something more.
My questions does not concern the American Civil War (which is too obvious), but instead, was there any situation in US history when one or more of the States announced they would secede? Was there an official way for states to secede?
By "on the official way" I mean that the local State government started any official actions in order to make their attempted secession from the USA legitimate.