Opposition to war with Britain (e.g., War of 1812) was strong in New England due to:
Merchants, shipowners, and artisans relied on British trade; war meant blockades, lost markets, and ruin.
Fear that war would centralize federal power and erode state/local self-governance.
Shared language, religion, and family ties with Britain fostered reluctance to fight "kin."
Quakers and other peace churches morally opposed all war.
Resentment over British policies made without colonial input—but also skepticism that war would improve representation.
Memories of King Philip's War, Queen Anne's War, and the Revolution made another conflict deeply unpopular.
Not all New Englanders opposed war; pro-independence sentiment coexisted. But the above factors made the region a hotbed of anti-war Federalist politics.