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When embargo failed to remedy the situation and Great Britain refused to rescind the Orders in Council (1807) and France continued its decrees, certain Democratic-Republicans known as war hawks felt compelled to go to war. Henry Clay and John C. Calhoun pushed a declaration of war through Congress, stressing a short war had the added benefit of permitting the United States to grab valuable farmlands in the British colony of Canada. Vehement protests erupted in those parts of the country where the opposition Federalist political party held sway, especially in Connecticut and Massachusetts. The governors of these two states as well as Rhode Island refused to place their state militias under federal control for duty outside their respective states. In the elections that followed in a few months, some members of Congress who voted for war, paid the price. Eight New England congressmen were rejected by the voters, and several others saw the writing on the wall and declined to seek reelection. There was a complete turnover of the New Hampshire delegation. 
Federalists were opposed to war with Great Britain before 1812, which can be seen in their opposition to the Embargo of 1807. While many Democrat-republicans thought of the war as a "test of the Republic", Federalists denounced calls for war, with John Randolph advising Madison to abandon the thought of war, as it would threaten United States commerce.  All members of Congress that voted for war were Republicans, while 22 opposed war, along with 40 Federalists.  Following Madison's declaration of war, the Federalist minority in the House of Representatives released "An Address...to their constituents on the war with Great Britain", which identified the Federalists as the party of peace, rebuffing many of the points Madison made in his declaration of war. 
As the war continued, New England Federalists maintained their opposition. But this is not to say the region as a whole opposed the national war effort. Much of the financing and a substantial portion of the army and navy came from the region. In number of recruits furnished the regular army, only New York supplied more. Elbridge Gerry, the Vice President, and William Eustis, the secretary of war, hailed from Massachusetts. A top army general, Henry Dearborn, came from New Hampshire, and illustrious naval officers such as Isaac Hull, Charles Morris, and Oliver Hazard Perry were New Englanders. As important, New England sent more officially sanctioned privateers to sea than other areas. 
Throughout the war, Federalists in Congress stifled bills that levied more funding for the war, and in September 1814, when Madison issued a conscription bill to increase the number of men within the professional army, Federalists publicly opposed the bill, and likened it the Napoleon's levée-en-masse, once again conflating Republicans with the French dictator. 
The Federalists had no control of national policy, however. As the war dragged on, they grew increasingly frustrated. Eventually, some in New England, began to advocate constitutional changes that would increase their diminished influence at the national level. The Hartford Convention, with 26 delegates from Massachusetts, Connecticut, Rhode Island, and dissident counties in Vermont and New Hampshire, was held in December 1814 to consider remedies. It was called to discuss proposed Constitutional amendments.Many federalists within Massachusetts believed that the Hartford Convention was the only way to save the Union from Republicans, and from civil war.  Its final report called for several Constitutional amendments. However, when convention representatives arrived in Washington to advocate their changes, they were greeted with news of a peace treaty with Britain, the Treaty of Ghent, which essentially restored the pre-war status quo, as well as the great American victory at the Battle of New Orleans. This undercut their position, leaving them with little support. They returned home, and the decline of the Federalist Party continued.
At the outbreak of war, there was widespread resistance by many Americans, with many militias refusing to go to war, and bankers even refusing to back a Federal currency, and relieve the government of its debt.  A Massachusetts paper, the Salem Gazette, reprinted Madison's Federalist No. 46, in which Madison made the argument for defending states' rights against a national government, in response to the national government trying to press the state militia into national service. 
While a sense of patriotism offered support for the war, outside Federalist strongholds, as the war dragged on and the U.S. suffered frequent reversals on land, opposition to the war extended beyond Federalist leaders. As a result, the pool of army volunteers dried.
For example, after the British seized Fort Niagara and sacked the town of Lewiston, New York, General George McClure tried to call up the local militia to drive them back, but found that most would not respond, tired of repeated drafts and his earlier failures. Even those who did appear, McClure wrote, were more interested "in taking care of their families and property by carrying them into the interior, than helping us to fight." 
There were many examples of other militias refusing to enter Canada, and either disobeying or simply refusing orders to move into Canadian territory. Political opinions even interfered with communication between officers at the beginning of the war. 
This was shown in national recruitment efforts as well. While Congress authorized the War Department to recruit 50,000 one-year volunteers, only 10,000 could be found, and the Army never reached half of its authorized strength. A national conscription plan was proposed in Congress, but defeated with the aid of Daniel Webster, though several states passed conscription policies. Even Kentucky, home state of the best-known war hawk Henry Clay, was the source of only 400 recruits in 1812.[ citation needed] It was not until the war was concluded that its retrospective popularity shot up again. 
Many members of the Democratic-Republican Party viewed opposition as treasonous or near-treasonous once the war was declared. The Washington National Intelligencer wrote that, "WAR IS DECLARED, and every patriot heart must unite in its support... or die without due cause." The Augusta Chronicle wrote that "he who is not for us is against us." 
This sentiment was especially strong in Baltimore, at the time a boomtown with a large population of recent French, Irish, and German immigrants who especially hated Britain. In early 1812, several riots took place, centering on the anti-war Federalist newspaper the Federal Republican. Its offices were destroyed by a mob. Local and city officials, all war hawks, expressed disapproval of the violence but did little to stop it.  When the editors of Federal Republican tried to return, they were removed from protective custody in a jail by a mob, on the night of July 27, and tortured; one Revolutionary War veteran, James Lingan, died of his injuries. Opponents of the war then largely ceased to openly express their opposition in Baltimore. However, Federalists did take advantage of the incident to publicize Lingan's funeral in stories that were widely printed about around the country. 
The Baltimore riots were the height of violent backlash during the war, whose popularity dropped through 1813 and 1814. However, after the war, when the Hartford Convention's proceedings became public just after a peace treaty was signed with Britain, there was a longer-term backlash against the Federalist Party, which became associated with secession and treason. The party never regained national predominance, fielding its last Presidential candidate in 1816 and fading away entirely by the end of the 1820s.
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The War of 1812 was the first war declared by the United States, as the U.S., and so some historians see it as the first to develop widespread antiwar sentiment. (However, there was also anti-war sentiment during the Quasi-War and the First Barbary War.) There is little direct continuity between the opponents of the War of 1812 and later antiwar movements, as the Federalist party's objections weren't based on pacifism, and as this same "antiwar" party effectually disappeared soon after peace was concluded. The end of the war also influenced the growing unpopularity of the Federalist party, as The Hartford Convention was quickly condemned by Republicans, especially in light of the American victory at New Orleans. 
However, the war did result in the formation of the New York Peace Society in 1815 in an effort to prevent similar future wars. The New York Peace Society was the first peace organization in the United States, lasting in various incarnations until 1940. A number of other peace societies soon formed, including eventually the American Peace Society, a national organization which exists to the present day. The American Peace Society was formed in 1828 by the merger of the Massachusetts Peace Society and similar societies in New York, Maine, and New Hampshire. 
The War of 1812 is less well known than 20th-century U.S. wars, but no other war had the degree of opposition by elected officials. Nevertheless, historian Donald R. Hickey has argued that, "The War of 1812 was America's most unpopular war. It generated more intense opposition than any other war in the nation's history, including the war in Vietnam." 
- ^ Hickey (1990), pp. 54–5
- ^ Hickey (1990), p. 142
- ^ Hoey (2000), web[ clarification needed]
- ^ Hickey (1990), p. 55
- ^ Hickey (1990), pp. 56–58
- ^ Hickey (1990), pp. 64–66
- ^ "Guide to the Microfilm..." (2006), web[ clarification needed]
- ^ Hickey (1990), p. 255
- James H. Ellis, A Ruinous and Unhappy War: New England and the War of 1812New York: Algora Publishing, 2009, p. 80
- Brown. The Republic in Peril: 1812. Page 42.
- Brown. The Republic in Peril: 1812. Page 165.
- Buel. America on the Brink: Federalism during the Jeffersonian Ascendancy Page 157.
- Ellis, p 2
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- Strum. New York Federalists and Opposition to the War of 1812." World Affairs, vol. 142, no. 3, 1980, pp. 169–187.
- Bickam. WEIGHT OF VENGEANCE: the United States, the British Empire, and the War of 1812. Page 187.
- Stoltz. A Bloodless Victory.
- Ellis, James (2009). A Ruinous and Unhappy War. New York: Algora Publishing. ISBN 978-0-87586-690-1.
- Hickey, Donald (1990) . The War of 1812. Urbana: University of Illinois Press. ISBN 0-252-06059-8.
- Hoey, John B. (Winter 2000). "Federalist Opposition To The War Of 1812". The Early America Review. DEV Communications, Inc. 3 (1). ISSN 1090-4247.
- "Guide to the Microfilm Edition of the Records of the New York Peace Society 1818-1843, 1906-1940". Thomson Gale. Archived from the original on 2005-01-25. Retrieved 2006-04-20.