My one conversation with Kennan, who once was ambassador to Moscow, began with Russia and quickly turned to the depth of his conservatism. Asked what shaped his ideas about Russia, he recalled his professors at the University of Berlin in 1927. They had taught him about Realien, the givens of geography, climate and race that shaped nations and international relations. (The English "realities" doesn't suggest the word's resonance in 18th Century German philosophy.) Realien outlasted ephemera like ideology and even political systems--and should, he believed, be the basis of any foreign policy.
"However one cuts it, the question is not whether there are limits to this country's ability to absorb immigration; the question is only where those limits lie, and how they should be determined and enforced—whether by rational decision at this end or by the ultimate achievement of some sort of a balance of misery between this country and the vast pools of poverty elsewhere that now confront it. The inability of any society to resist immigration … is a serious weakness, and possibly even a fatal one, in any national society." (p. 19) ...
But, you could actually say stuff like that in the past, before immigration ascended to an unquestionable sacred civil right that the rest of the world's population holds over the citizens of the United States (an ideological development of roughly the period when Carlos Slim bailed out the New York Times -- purely coincidental, I'm sure).
Writing on a flight to Los Angeles in 1978, Kennan thinks about how few white faces he will see when he lands and laments the decline of people “of British origin, from whose forefathers the constitutional structure and political ideals of the early America once emerged.” Instead, he predicts, Americans are destined to “melt into a vast polyglot mass, . . . one huge pool of indistinguishable mediocrity and drabness.”