“The folly consisted not in pursuit of a goal in ignorance of the obstacles but in persistence in the pursuit despite accumulating evidence that the goal was unattainable, and the effect disproportionate to the American interest and eventually damaging to American society, reputation and disposable power in the world.”
― Barbara W. Tuchman, The March of Folly: From Troy to Vietnam
"In the discussions to which this interest has given rise and in the arrangements by which they may terminate the occasion has been judged proper for asserting, as a principle in which the rights and interests of the United States are involved, that the American continents, by the free and independent condition which they have assumed and maintain, are henceforth not to be considered as subjects for future colonization by any European powers. "
-- James Monroe, speech to the US Congress on December 2, 1823