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British forces in 1837 invaded U. S. territory to destroy the steamboat Caroline, which Canadian rebels had used to transport weapons into Ontario.
Webster asserted that Britain failed to show that “the necessity of self-defense was instant, overwhelming, leaving no choice of means, and no moment of deliberation.” Pre-emption opponents would argue that Britain should have waited until the Caroline reached Canada before attacking.
Would an American strike today against North Korea’s nuclear-weapons program violate Webster’s necessity test? Clearly not.