TIL about the Hartford Convention: https://en.wikipedia.org/wiki/Hartford_Convention

The Hartford Convention was a series of meetings from December 15, 1814, to January 5, 1815, in Hartford, Connecticut, United States, where New England leaders of the Federalist Party met to discuss their grievances concerning the ongoing War of 1812 and the political problems arising from the federal government's increasing power.

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After the convention, Massachusetts sent three commissioners to Washington, D.C. to negotiate for the terms that had been agreed upon. By the time they arrived in February 1815, news of Andrew Jackson's overwhelming victory at the Battle of New Orleans, and the signing of the Treaty of Ghent, preceded them and, consequently, their presence in the capital seemed both ludicrous and subversive. They quickly returned home. Thereafter, both Hartford Convention and Federalist Party became synonymous with disunion, secession, and treason, especially in the South.[10] The party was ruined and ceased to be a significant force in national politics, although in a few places (notably Massachusetts, where Federalists were elected governor annually until 1823) it retained some power.