“On July 28th 2006, I was very proud to become a citizen of the United States — the greatest privilege on planet Earth.”

All the Trouble in the World (1994)

This I Believe (1952)
Context: I believe in —  I am proud to belong to —  the United States. Despite shortcomings, from lynchings to bad faith in high places, our nation has had the most decent and kindly internal practices and foreign policies to be found anywhere in history.
And finally, I believe in my whole race. Yellow, white, black, red, brown — in the honesty, courage, intelligence, durability … and goodness …. of the overwhelming majority of my brothers and sisters everywhere on this planet. I am proud to be a human being. I believe that we have come this far by the skin of our teeth, that we always make it just by the skin of our teeth — but that we will always make it … survive … endure. I believe that this hairless embryo with the aching, oversize brain case and the opposable thumb, this animal barely up from the apes, will endure — will endure longer than his home planet, will spread out to the other planets, to the stars, and beyond, carrying with him his honesty, his insatiable curiosity, his unlimited courage — and his noble essential decency.
This I believe with all my heart.

2014, Young Southeast Asian Leaders Initiative Town Hall Speech (November 2014)
Context: I’m very proud of the United States. I believe that the United States is a force for good around the world. But I wouldn’t be a good President if I don’t listen to criticism of our policies and stay open to what other countries say about us. Sometimes I think those criticisms are unfair. Sometimes I think people like to complain about the United States because we’re doing too much. Sometimes they complain because they’re doing too little. Every problem around the world, why isn’t the United States doing something about it. Sometimes there are countries that don’t take responsibility for themselves and they want us to fix it. And then when we do try to fix it, they say why are you meddling in our affairs. Yes, it’s kind of frustrating sometimes. But the fact that we are getting these criticisms means that we’re constantly thinking, okay, is this how we should apply this policy? Are we doing the right thing when we provide aid to a country, but the country is still ruled by a small elite and maybe it’s not getting down to the people? Are we doing the right thing when we engage in training a military to become more professional, but maybe the military is still engaging in repressive activity? If we’re not open to those criticisms, then we won’t get better, we won’t improve.

citation needed
Weekend Update samples

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

Washington Week http://www.pbs.org/weta/washingtonweek/transcripts/transcript081806.html, August 18, 2006

Draft of proposed Amendment to the Constitution by Jefferson, who thought an amendment would be necessary to authorize the Louisiana Purchase to be incorporated into the United States (August 1803)
1800s, First Presidential Administration (1801–1805)

Source: The Long Emergency (2005), Chapter 5, p. 149.