“The formation of such feelings of obligation and loyalty to any group with which one is identified is of the highest significance to good morale. It is the essence of the powerful patriotic feelings which are stimulated in times of war, but which have their origins in earliest childhood. …Not all Americans have been able to develop a range of identification large enough to include the nation and thus to develop strong feelings of loyalty and obligation. To some extent this ability seems to be a measure of social maturity.”

This Is My Story (1937)

Behaving on a still higher moral level were the astronauts who went to the Moon, for their actions tend toward the survival of the entire race of mankind. The door they opened leads to the hope that H. sapiens will survive indefinitely long, even longer than this solid planet on which we stand tonight. As a direct result of what they did, it is now possible that the human race will never die.
Many short-sighted fools think that going to the Moon was just a stunt. But the astronauts knew the meaning of what they were doing, as is shown by Neil Armstrong's first words in stepping down onto the soil of Luna: "One small step for a man, one giant leap for mankind."
The Pragmatics of Patriotism (1973)

The Awakening (1899)

England and the Need for Nations (2006)

In a Interview With Shirley K. Cohen http://oralhistories.library.caltech.edu/32/1/OH_Patterson.pdf

2010s, South Korea's Collective Shrug (May 2010)

As for international understanding, I feel that macaroni has done more for our appreciation of Italy than Mussolini... in food, as in death, we feel the essential brotherhood of mankind.
Source: The Importance of Living (1937), Ch. IV : On Having A Stomach, p. 46

1910s, Letter to the American Defense Society (1919)
Context: In the first place we should insist that if the immigrant who comes here in good faith becomes an American and assimilates himself to us, he shall be treated on an exact equality with everyone else, for it is an outrage to discriminate against any such man because of creed, or birthplace, or origin. But this is predicated upon the man's becoming in very fact an American, and nothing but an American. If he tries to keep segregated with men of his own origin and separated from the rest of America, then he isn't doing his part as an American. There can be no divided allegiance here. Any man who says he is an American, but something else also, isn't an American at all. We have room for but one flag, the American flag, and this excludes the red flag, which symbolizes all wars against liberty and civilization, just as much as it excludes any foreign flag of a nation to which we are hostile. We have room for but one language here, and that is the English language, for we intend to see that the crucible turns our people out as Americans, of American nationality, and not as dwellers in a polyglot boarding-house; and we have room for but one soul loyalty, and that is loyalty to the American people.

Czar Nicholas II
1905
Collected Tales, Sketches, Speeches, & Essays, 1891-1910 (1992) ed. Louis J. Budd