“Ours was the first nation to be founded on the idea that all are created equal and all deserve equal treatment under the law. Despite our missteps and shortcomings, these ideals still inspire hope among the oppressed and give us pride in being Americans.”

as quoted by Dr. Javed Laghari in Monograph titled "Leaders of Pakistan" published by SZABIST, Pages 2-10 ( Vol.1 June-2009 http://www.szabist.edu.pk/Publications/Books/LeadershipBK-CP-09.pdf/). Retrieved on July 21, 2016

2000s, 2003, Hope and Conscience Will Not Be Silenced (July 2003)
Context: There was a time in my country's history where one in every seven human beings was the property of another. In law, they were regarded only as articles of commerce, having no right to travel or to marry or to own possessions. Because families were often separated, many were denied even the comfort of suffering together. For 250 years the captives endured an assault on their culture and their dignity. The spirit of Africans in America did not break. Yet the spirit of their captors was corrupted. Small men took on the powers and airs of tyrants and masters. Years of unpunished brutality and bullying and rape produced a dullness and hardness of conscience. Christian men and women became blind to the clearest commands of their faith and added hypocrisy to injustice. A republic founded on equality for all became a prison for millions. And yet in the words of the African proverb, no fist is big enough to hide the sky. All of the generations oppressed under the laws of man could not crush the hope of freedom and defeat the purposes of God.

1960s, The American Promise (1965)
Context: This was the first nation in the history of the world to be founded with a purpose. The great phrases of that purpose still sound in every American heart, North and South: "All men are created equal" — "government by consent of the governed" — "give me liberty or give me death." Well, those are not just clever words, or those are not just empty theories. In their name Americans have fought and died for two centuries, and tonight around the world they stand there as guardians of our liberty, risking their lives. Those words are a promise to every citizen that he shall share in the dignity of man. This dignity cannot be found in a man's possessions; it cannot be found in his power, or in his position. It really rests on his right to be treated as a man equal in opportunity to all others. It says that he shall share in freedom, he shall choose his leaders, educate his children, and provide for his family according to his ability and his merits as a human being.

radio address https://georgewbush-whitehouse.archives.gov/news/releases/2008/11/20081101.html (1 November 2008)
2000s, 2008

2000s, The Central Idea (2006)
Context: According to Abraham Lincoln, public opinion always has a central idea from which all its minor thoughts radiate. The central idea of the American Founding—and indeed of constitutional government and the rule of law—was the equality of mankind. This thought is central to all of Lincoln's speeches and writings, from 1854 until his election as president in 1860. It is immortalized in the Gettysburg Address.

Source: Speech (June 1853), p. 79

"Barack Obama: The President's News Conference With Prime Minister Reinfeldt of Sweden in Stockholm" by Gerhard Peters and John T. Woolley, atThe American Presidency Project (4 September 2013)
2013

Remarks by President Obama and President Kenyatta of Kenya in a Press Conference at Kenyan State House in Nairobi, Kenya https://www.whitehouse.gov/the-press-office/2015/07/25/remarks-president-obama-and-president-kenyatta-kenya-press-conference (July 25, 2015)
2015
Context: I believe in the principle of treating people equally under the law, and that they are deserving of equal protection under the law and that the state should not discriminate against people based on their sexual orientation. And I say that, recognizing that there may be people who have different religious or cultural beliefs. But the issue is how does the state operate relative to people. If you look at the history of countries around the world, when you start treating people differently -- not because of any harm they’re doing anybody, but because they’re different -- that’s the path whereby freedoms begin to erode and bad things happen. And when a government gets in the habit of treating people differently, those habits can spread. And as an African-American in the United States, I am painfully aware of the history of what happens when people are treated differently, under the law, and there were all sorts of rationalizations that were provided by the power structure for decades in the United States for segregation and Jim Crow and slavery, and they were wrong.

1960s, Civil Rights Bill signing speech (1964)