Why did the Federalist Party lose support after the War of 1812?

The Federalists strongly opposed the War of 1812, arguing that it would damage trade and hurt New England. Their opposition became especially unpopular when the war ended with a surge of national pride and the United States was widely seen as having defended its independence. The Hartford Convention, where Federalists criticized the war and proposed changes to federal power, further damaged the party’s reputation. Thus, “It had opposed the war” is the best answer.

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