Did deglegates to the Hartford convention threaten to secede from the US?

Yes, delegates to the Hartford Convention in 1814 did threaten to secede from the United States. This gathering, held by Federalists in New England, was primarily in response to the War of 1812 and the perceived neglect of their region's interests by the federal government. While the convention ultimately did not lead to secession, it highlighted deep regional tensions and dissatisfaction with federal policies at the time.