“We should pause to appreciate that the American democratic experiment in ethnic and racial diversity is nearly unique. Indeed, the very idea of racial diversity and nationhood does not have much of a record of success in history. Few countries have been able to transcend their ethnic origins and sustain a racially pluralistic society. Rome was an exception and pulled it off for nearly 500 years, as the Roman Empire grew to encompass non-Italian peoples from the Euphrates to Scotland before unwinding into tribal chaos. The Ottoman and Austro-Hungarian Empires worked for long periods, though they relied on the use of autocratic force and imperial coercion to suppress minorities, in ways antithetical to modern notions of governance.”

Who is Loyal to America? (1947)
Context: Independence was an act of revolution; republicanism was something new under the sun; the federal system was a vast experimental laboratory. Physically Americans were pioneers; in the realm of social and economic institutions, too, their tradition has been one of pioneering. From the beginning, intellectual and spiritual diversity have been as characteristic of America as racial and linguistic. The most distinctively American philosophies have been transcendentalism — which is the philosophy of the Higher Law and pragmatism — which is the philosophy of experimentation and pluralism. These two principles are the very core of Americanism: the principle of the Higher Law, or of obedience to the dictates of conscience rather than of statutes, and the principle of pragmatism, or the rejection of a single good and of the notion of a finished universe. From the beginning Americans have known that there were new worlds to conquer, new truths to be discovered. Every effort to confine Americanism to a single pattern, to constrain it to a single formula, is disloyalty to everything that is valid in Americanism.

Living Systems: Basic Concepts (1969)

Source: Pope Francis will see a lively faith in Peru and Chile, Lima's cardinal says https://www.catholicnewsagency.com/news/37324/pope-francis-will-see-a-lively-faith-in-peru-and-chile-limas-cardinal-says (5 December 2017)

Statement by the President on the Occasion of Ramadan (11 August 2010) http://www.whitehouse.gov/the-press-office/2010/08/11/statement-president-occasion-ramadan
2010

Though race related issues continue to occupy a significant portion of our political discussion, and though there remain many unresolved racial issues in this nation, we, average Americans, simply do not talk enough with each other about race. It is an issue we have never been at ease with and given our nation’s history this is in some ways understandable. And yet, if we are to make progress in this area we must feel comfortable enough with one another, and tolerant enough of each other, to have frank conversations about the racial matters that continue to divide us.
February 18, 2009.
Remarks at the Department of Justice African American History Month Program. http://www.usdoj.gov/ag/speeches/2009/ag-speech-090218.html
2000s

Who Are We? The Challenges to America's National Identity (2004), p. 12

2010s, 2015, Speech on (20 July 2015)

2010s, America: One Nation, Indivisible (2015)

2000s, Is Diversity Good? (2003)