Final answer:
The Hartford Convention's timing and its outward appearance of unpatriotism led to the fall of the Federalist Party, as it was seen as unsupportive of the nation during a crucial victory in the War of 1812.
Step-by-step explanation:
The Hartford Convention was a series of meetings in which New England Federalists discussed their grievances concerning the War of 1812, and some even proposed secession from the United States. This convention coincided with Andrew Jackson's victory in New Orleans. The timing and the very suggestion of secession made the Federalists appear unpatriotic, leading to the eventual death of the Federalist Party.
The War of 1812's unpopularity in New England and the resentment towards Virginian power exacerbated the Federalists' discontent. They viewed the war as harmful to their maritime-based economy. The Hartford Convention's condemnation of the government and the calls for secession during wartime ultimately discredited the Federalist Party to a point from which it could not recover. By appearing anti-patriotic at a time of national triumph, the Federalists lost the trust and confidence of the American public and faded from the political scene after 1815.