The Federalist Papers · Federalist No. 6 · paragraph 21

So far is the general sense of mankind from corresponding with the tenets of those who endeavor to lull asleep our apprehensions of discord and hostility between the States, in the event of disunion, that it has from long observation of the progress of society become a sort of axiom in politics, that vicinity or nearness of situation, constitutes nations natural enemies. An intelligent writer expresses himself on this subject to this effect: “NEIGHBORING NATIONS (says he) are naturally enemies of each other unless their common weakness forces them to league in a CONFEDERATE REPUBLIC, and their constitution prevents the differences that neighborhood occasions, extinguishing that secret jealousy which disposes all states to aggrandize themselves at the expense of their neighbors.” This passage, at the same time, points out the EVIL and suggests the REMEDY.

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