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Secession is unconstitutional, so I'm not sure how official the actions towards it could be. But I do know what you mean.
The Wikipedia page contains a few examples of both ridiculous and serious attempts of states to secede or to affirm their right to secede. It also details all the civil war stuff along side bizzare ideas for new states like State of Jefferson or Southern California.
Upvote:4
Pretty much from the foundation of the Republic, states have discussed leaving the union. List of proposals The Kentucky and Virgiania resolutions were the first step to separation from the union.
Upvote:7
There was one other attempt. It was by South Carolina in 1833. The American President of the time was Andrew Jackson (from Tennessee). The Vice-President was John C. Calhoun of South Carolina, who was in favor of succession, and who said, "The Union, next to our Liberty, the most dear." Jackson retorted, "The Union, it must be preserved." Daniel Webster summed it up by saying, "Liberty and Union, now and forever, one and inseparable."
Jackson threatened to hang Calhoun for treason if South Carolina seceded. It didn't.