- John Quincy Adams
John Quincy Adams was the former President of the United States and a member of the House of Representatives at the time of the War of 1812. He opposed the war because he believed that it would be harmful to the American economy and that it would strengthen Britain's position in North America.
- James Madison
James Madison was the President of the United States during the War of 1812. He initially opposed the war, but he eventually supported it after the British refused to negotiate a settlement. He believed that the war was necessary to defend American honor and to protect American trade.
- Elbridge Gerry
Elbridge Gerry was the Vice President of the United States during the War of 1812. He opposed the war because he believed that it would be too expensive and that it would not achieve its goals.
- Rufus King
Rufus King was a member of the United States Senate during the War of 1812 and a leading Federalist. He was one of the most outspoken opponents of the war. He argued that the war was unnecessary and that it would damage American interests.
There were many different reasons for people to oppose the War of 1812. Some people believed that the war was not in the best interests of the United States, while others believed that the war was too costly or that it would not achieve its goals. Additionally, some people were simply opposed to the idea of war itself, and they believed that diplomacy and negotiation should be used to resolve international conflicts.