The Federalist Papers · Federalist No. 22 · paragraph 9

It may be objected to this, that not seven but nine States, or two thirds of the whole number, must consent to the most important resolutions; and it may be thence inferred that nine States would always comprehend a majority of the Union. But this does not obviate the impropriety of an equal vote between States of the most unequal dimensions and populousness; nor is the inference accurate in point of fact; for we can enumerate nine States which contain less than a majority of the people; and it is constitutionally possible that these nine may give the vote. Besides, there are matters of considerable moment determinable by a bare majority; and there are others, concerning which doubts have been entertained, which, if interpreted in favor of the sufficiency of a vote of seven States, would extend its operation to interests of the first magnitude. In addition to this, it is to be observed…

Publius · Alexander Hamilton, John Jay, James Madison · 1787–1788
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