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From the perspective of what became the Second Amendment, the most important essay was The Federalist No. 46, written by Madison and first published in the New York Packet on January 29, 1788. It clearly distinguished between the people and the two governments: “The Federal and State governments are in fact but different agents and trustees of the people, constituted with different powers, and designed for different purposes.” Further, “the ultimate authority ... resides in the people alone,” not in “the different governments.”69 As for the argument that the federal government would raise a standing army to oppress the people, Madison replied: To these would be opposed a militia amounting to near half a million of citizens with arms in their hands, officered by men chosen from among themselves, fighting for their common liberties, and united and conducted by governments possessing their affections and confidence. It may well be doubted, whether a militia thus circumstanced could ever be conquered by such a proportion of regular troops. Those who are best acquainted with the last successful resistance of this country against the British arms, will be most inclined to deny the possibility of it. Besides the advantage of being armed, which the Americans possess over the people of almost every other nation, the existence of subordinate governments, to which the people are attached, and by which the militia officers are appointed, forms a barrier against the enterprises of ambition, more insurmountable than any which a simple government of any form can admit of. Notwithstanding the military establishments in the several kingdoms of Europe, which are carried as far as the public resources will bear, the governments are afraid to trust the people with arms.70 A militia of “half a million of citizens with arms in their hands” would have been virtually all able-bodied male citizens out of the American population of three million. The “citizens” constituted the militia, and they had “arms in their hands.” The success of this armed citizenry had been demonstrated in the American Revolution. Unlike other peoples, the Americans were armed, and the resistance of the state governments would bar a federal tyranny. By contrast, the European monarchies were “afraid to trust the people with arms.” In short, the keeping and bearing of arms by the citizens would preserve the republic and protect liberty.
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Stephen P. Halbrook (The Founders' Second Amendment: Origins of the Right to Bear Arms (Independent Studies in Political Economy))