Who plotted to have New England secede from the union?

The plan to have New England secede from the Union was primarily associated with the Hartford Convention, which took place during the War of 1812. Delegates from the New England states convened to discuss their grievances against the federal government, particularly regarding the war and economic policies. While the convention did propose potential amendments to the Constitution, the idea of outright secession was not formally endorsed, and the convention ultimately lost momentum after the war's conclusion.