Final answer:
The Hartford Convention led to the decline and eventual demise of the Federalist Party due to perceived lack of patriotism and their timing with Andrew Jackson's victory in New Orleans.
Step-by-step explanation:
One effect of the Hartford Convention was the death of the Federalist party. The Hartford Convention was held in 1814, when delegates from New England states met to discuss their grievances and consider responses to the unpopular War of 1812.
The appearance of discussing secession and the timing of the victory in New Orleans led by Andrew Jackson tarnished the Federalist Party's image. The outcome of the Convention, coinciding with patriot fervor from the success in the War of 1812, resulted in a steep decline in support for the Federalist Party, leading to its eventual demise.