The Federalist Papers · Federalist No. 12 · paragraph 9

The relative situation of these States; the number of rivers with which they are intersected, and of bays that wash there shores; the facility of communication in every direction; the affinity of language and manners; the familiar habits of intercourse; —all these are circumstances that would conspire to render an illicit trade between them a matter of little difficulty, and would insure frequent evasions of the commercial regulations of each other. The separate States or confederacies would be necessitated by mutual jealousy to avoid the temptations to that kind of trade by the lowness of their duties. The temper of our governments, for a long time to come, would not permit those rigorous precautions by which the European nations guard the avenues into their respective countries, as well by land as by water; and which, even there, are found insufficient obstacles to the adventurous…

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