“Children are all foreigners.”

Caption to a political cartoon against the "America First" movement, showing children being read a story of "Adolf the Wolf", in PM Magazine (1 October 1941)

Preface
Sackett's Land (1974)
Context: We are all of us, it has been said, the children of immigrants and foreigners — even the American Indian, although he arrived here a little earlier. What a man is and what he becomes is in part due to his heritage, and the men and women who came west did not emerge suddenly from limbo. Behind them were ancestors, families, and former lives. Yet even as the domestic cattle of Europe evolved into the wild longhorns of Texas, so the American pioneer had the characteristics of a distinctive type.
Physically and psychologically, the pioneers' need for change had begun in the old countries with their decision to migrate. In most cases their decisions were personal, ordered by no one else. Even when migration was ordered or forced, the people who survived were characterized by physical strength, the capacity to endure, and not uncommonly, a rebellious nature.
History is not made only by kings and parliaments, presidents, wars, and generals. It is the story of people, of their love, honor, faith, hope and suffering; of birth and death, of hunger, thirst and cold, of loneliness and sorrow. In writing my stories I have found myself looking back again and again to origins, to find and clearly see the ancestors of the pioneers.

Book One in 'The Evil Apartment', B/O
The Master and Margarita (1967)

Letter to John Clellon Holmes (24 June 1949), published in The Beat Vision: A Primary Sourcebook (1987) edited by Arthur Knight and Kit Knight, page 93.

§ 5
From Lives and Opinions of the Eminent Philosophers by Diogenes Laërtius

Vol. II, Ch. XX, p. 474 (See also...David Ricardo, The Principles of Political Economy and Taxation, Ch. VII, p. 81).
(Buch II) (1893)

Source: 1930s, In Praise of Idleness and Other Essays (1935), Ch. 10: Modern Homogeneity