“So, what exactly are these folks protesting, and how does disrespecting the national anthem and the flag of the United States of America have to do with any of this? Doggone, like the United Negro College Fund commercial used to say, “a mind is a terrible thing to waste.””

Dave Barry Hits Below the Beltway (2001)

Proclamation against the Nullification Ordinance of South Carolina (11 December 1832)
1830s
Context: To say that any State may at pleasure secede from the Union, is to say that the United States are not a nation because it would be a solecism to contend that any part of a nation might dissolve its connection with the other parts, to their injury or ruin, without committing any offense. Secession, like any other revolutionary act, may be morally justified by the extremity of oppression; but to call it a constitutional right, is confounding the meaning of terms, and can only be done through gross error, or to deceive those who are willing to assert a right, but would pause before they made a revolution, or incur the penalties consequent upon a failure.

Source: The Sirens of Titan (1959), Chapter 3 “United Hotcake Preferred” (p. 65; epigram)

Source: The Poker Face of Wall Street (2006), Chapter 4, A Brief History of Risk Denial, p. 86

Source: Banal Nationalism (1995), p. 85

1900s, Address at Providence (1901)

2011, Address on interventions in Libya (March 2011)

Attributed to Washington in "Farewell to the United States of Europe: long live the EU!" by André Fontaine at Open Democracy (29 November 2001) http://www.opendemocracy.net/democracy-europefuture/article_344.jsp. It appears to have originally circulated in French:
:: Je suis citoyen de la Grande République de l'Humanité. Je vois le genre humain uni comme une grande famille par des liens fraternels. Nous avons jeté une semence de liberté et d'union qui germera peu à peu dans toute la Terre. Un jour, sur le modèle des Etats-Unis d'Amérique, se constitueront les États-Unis d'Europe. Les États-Unis seront le législateur de toutes les nationalités.
: An anonymous blogger in "Did George Washington predict a "United States of Europe"? (30 January 2010) http://racehist.blogspot.com/2010/01/did-george-washington-predict-united.html showed that it derived from Gustave Rodrigues, Le peuple de l'action: essai sur l'idéalisme américain (A. Colin, 1917), p. 207:
:: Washington écrivait à La Fayette qu'il se condérait comme « citoyen de la grande république de l'humanité » et ajoutait : « Je vois le genre humain uni comme une grande famille par des liens fraternels ». Ailleurs il écrivait, prophétiquement: « Nous avons jeté une semence de liberté et d'union qui germera peu à peu dans toute la terre. Un jour, sur le modèle des Etats-Unis d'Amérique, se constitueront les États-Unis d'Europe. »
: A translation by Louise Seymour Houghton ( The People of Action: An Essay on American Idealism (1918) http://books.google.com/books?id=b8Y9AAAAYAAJ) reads:
:: Washington wrote to Lafayette that he considered himself a "citizen of the great republic of humanity," adding: "I see the human race a great family, united by fraternal bonds." Elsewhere he wrote prophetically: "We have sown a seed of liberty and union that will gradually germinate throughout the earth. Some day, on the model of the United States of America, will be constituted the United States of Europe." [pp. 209-210]
: The first two quotations come from a letter to the Marquis de Lafayette of 15 August 1786 (see above) as quoted in Joseph Fabre's Washington, libérateur de l'Amérique: suivi de Washington et la revolution Américaine (Ch. Delagrave, 1886), and the third is also found in that source where, although placed between quotation marks, it is clearly intended as the author's own comments on what "Washington and his friends" were saying to the world by establishing the American Constitution. Gustave Rodrigues mistakenly printed Fabre's words as Washington's alongside some actual observations of his from a letter to Lafayette, and so created the misquotation.
Misattributed

1920s, Nationalism and Americanism (1920)
Context: The misfortune is not alone that it rends the concord of nations. The greater pity is that it rends the concord of our citizenship at home. It's folly to think of blending Greek and Bulgar, Italian and Slovak, or making any of them rejoicingly American, when the land of adoption sits in judgement on the land from which he came. We need to be rescued from divisionary and fruitless pursuit of peace through super government. I do not want Americans of foreign birth making their party alignments on what we mean to do for some nation in the old world. We want them to be Republican because of what we mean to do for the United States of America. Our call is for unison, not rivaling sympathies. Our need is concord, not the antipathies of long inheritance.