Who opposed the war of 1812?

The War of 1812 was fought between the United States and Great Britain. This war was fought over various insults felt by the Americans, including the Royal Navy's tendency to impress American seamen and attempts by Great Britain to hinder US trade.
Not everyone thought it as good of an idea to go to war as the Republican Party. There were others, besides the British, who opposed the US's fight against Great Britain. The Federalists (the opposing party to the Republicans), for example, had a more favorable view of the British. In fact, when congress voted on the war, not one member of the Federalist party voted to go to war.
In addition, many citizens in the New England area opposed going to war for various reasons. Besides economic concerns, many individuals had religious objections to the war, and the opposition to the war was often a subject preached about from pulpits.
https://www.history.com/topics/war-of-1812