“What we need in the United States is not division; what we need in the United States is not hatred; what we need in the United States is not violence and lawlessness, but is love, and wisdom, and compassion toward one another, and a feeling of justice toward those who still suffer within our country, whether they be white or whether they be black.”

1910s, Address to the Knights of Columbus (1915)
Context: Four centuries and a quarter have gone by since Columbus by discovering America opened the greatest era in world history. Four centuries have passed since the Spaniards began that colonization on the main land which has resulted in the growth of the nations of Latin-America. Three centuries have passed since, with the settlements on the coasts of Virginia and Massachusetts, the real history of what is now the United States began. All this we ultimately owe to the action of an Italian seaman in the service of a Spanish King and a Spanish Queen. It is eminently fitting that one of the largest and most influential social organizations of this great republic, a republic in which the tongue is English, and the blood derived from many sources, should, in its name, commemorate the great Italian. It is eminently fitting to make an address on Americanism before this society. We of the United States need above all things to remember that, while we are by blood and culture kin to each of the nations of Europe, we are also separate from each of them. We are a new and distinct nationality. We are developing our own distinctive culture and civilization, and the worth of this civilization will largely depend upon our determination to keep it distinctively our own. Our sons and daughters should be educated here and not abroad. We should freely take from every other nation whatever we can make of use, but we should adopt and develop to our own peculiar needs what we thus take, and never be content merely to copy.

2010s, 2015, Presidential Bid Announcement (June 16, 2015)

Letter to Joseph Sturge (29 September 1852), as quoted in Gettysburg: The Last Invasion https://books.google.com/books?id=i5u1P0Fq4GYC&printsec=frontcover&dq=0307594084&hl=en&sa=X&ved=0ahUKEwj17N6CovLcAhUPUt8KHTa1CrgQ6AEIKDAA#v=onepage&q&f=false (2013), by Allen C. Guelzo, p. xviii
1850s

As quoted in "Yearning for Change: Italian Diplomacy Just Got Younger" by Walter Mayr, in Der Spiegel (4 July 2014) http://www.spiegel.de/international/europe/youthful-italian-foreign-minister-mogherini-confident-of-success-a-979059.html.

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.

Speech on the Assassination of Martin Luther King, Jr. (1968)
Context: Martin Luther King dedicated his life to love and to justice between fellow human beings. He died in the cause of that effort. In this difficult day, in this difficult time for the United States, it's perhaps well to ask what kind of a nation we are and what direction we want to move in. For those of you who are black -- considering the evidence evidently is that there were white people who were responsible -- you can be filled with bitterness, and with hatred, and a desire for revenge. We can move in that direction as a country, in greater polarization -- black people amongst blacks, and white amongst whites, filled with hatred toward one another. Or we can make an effort, as Martin Luther King did, to understand, and to comprehend, and replace that violence, that stain of bloodshed that has spread across our land, with an effort to understand, compassion, and love. [... ] But we have to make an effort in the United States. We have to make an effort to understand, to get beyond, or go beyond these rather difficult times.

http://www.cnn.com/2006/WORLD/meast/09/04/iran.khatami/index.html.
Terrorism

From an appearance on Meet the Press in 1973, ‘Meet the Press’ transcript for Nov. 18, 2007 http://www.msnbc.msn.com/id/21869109/page/6/,
Interviews

English Language Leaders' Debate, April 12, 2011, http://www.ctv.ca/servlet/ArticleNews/story/CTVNews/20110413/main-election-110413/20110413?s_name=election2011