“Carolina or Virginia may try to break away. In the effort it may destroy its local government as it has now destroyed it, except by successful revolution no rebellious state can escape the jurisdiction, and it will be reorganized exclusively by the national authority of the United States of America. This is what Gettysburg roars and Vicksburg and Port Royal. This is the thunder of the Kearsarge as she sinks the Alabama, This is the song of Sherman's march to the sea; and Lee's surrender, the fall of Richmond, and the universal crash of the rebellion mutter and murmur their reluctant 'Amen, Amen'. But, at the same moment that the profound sense of nationality and the power of the nation are revealed, the national mind has gained a clear perception of the relation of morals and politics, the strict dependence of civil order and national prosperity upon morality.”

"Niagara Movement Speech" (1905) http://teachingamericanhistory.org/library/document/niagara-movement-speech/ <!--originally a portion of this was cited here to an Address to the Nation speech at Harpers Ferry, Virginia (16 August 1906); published in the New York Times on (20 August 1906) — but that does not correspond with the info at the link. -->
Context: The school system in the country districts of the South is a disgrace and in few towns and cities are Negro schools what they ought to be. We want the national government to step in and wipe out illiteracy in the South. Either the United States will destroy ignorance or ignorance will destroy the United States.
And when we call for education we mean real education. We believe in work. We ourselves are workers, but work is not necessarily education. Education is the development of power and ideal. We want our children trained as intelligent human beings should be, and we will fight for all time against any proposal to educate black boys and girls simply as servants and underlings, or simply for the use of other people. They have a right to know, to think, to aspire.
These are some of the chief things which we want. How shall we get them? By voting where we may vote, by persistent, unceasing agitation; by hammering at the truth, by sacrifice and work.
We do not believe in violence, neither in the despised violence of the raid nor the lauded violence of the soldier, nor the barbarous violence of the mob, but we do believe in John Brown, in that incarnate spirit of justice, that hatred of a lie, that willingness to sacrifice money, reputation, and life itself on the altar of right. And here on the scene of John Brown’s martyrdom we reconsecrate ourselves, our honor, our property to the final emancipation of the race which John Brown died to make free.
Our enemies, triumphant for the present, are fighting the stars in their courses. Justice and humanity must prevail.

Introduction, p. xxv
The Age of Fallibility (2006)
Context: We must recognize that as the dominant power in the world we have a special responsibility. In addition to protecting our national interests, we must take the leadership in protecting the common interests of humanity. I go into some detail as to what that entails.
Mankind’s power over nature has increased cumulatively while its ability to govern itself has not kept pace. There is no other country that can take the place of the United States in the foreseeable future. If the United States fails to provide the right kind of leadership our civilization may destroy itself. That is the unpleasant reality that confronts us.

1860s, Proclamation of Amnesty and Reconstruction (1863)

Chpt.1, p. 2
Principles of Geology (1832), Vol. 1

Source: The Secret Teachings of All Ages (1928), p. xc
Context: European mysticism was not dead at the time the United States of America was founded. The hand of the mysteries controlled in the establishment of the new government for the signature of the mysteries may still be seen on the Great Seal of the United states of America. Careful analysis of the seal discloses a mass of occult and Masonic symbols chief among them, the so-called American Eagle. … the American eagle upon the Great Seal is but a conventionalized phoenix... Not only were many of the founders of the United States government Masons, but they received aid from a secret and august body existing in Europe which helped them to establish this country for a peculiar and particular purpose known only to the initiated few. The Great Seal is the signature of this exalted body —unseen and for the most part unknown — and the unfinished pyramid upon its reverse side is a trestleboard setting forth symbolically the task to the accomplishment of which the United States Government was dedicated from the day of its inception.

October 19, 2004 http://www.federalreserve.gov/boarddocs/speeches/2004/20041019/default.htm, playing down the threat of a national housing bubble.
2000s

Patriotism and Government

James M. McPherson. "No Peace without Victory, 1861–1865" https://web.archive.org/web/20050404133343/http://www.historians.org/info/AHA_History/JMMcPherson.htm (2003), American Historical Association
2000s

Source: Blood in My Eye (1971), p. 120