The Federalist Papers · Federalist No. 29 · paragraph 16

In times of insurrection, or invasion, it would be natural and proper that the militia of a neighboring State should be marched into another, to resist a common enemy, or to guard the republic against the violence of faction or sedition. This was frequently the case, in respect to the first object, in the course of the late war; and this mutual succor is, indeed, a principal end of our political association. If the power of affording it be placed under the direction of the Union, there will be no danger of a supine and listless inattention to the dangers of a neighbor, till its near approach had superadded the incitements of selfpreservation to the too feeble impulses of duty and sympathy.

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