Zobel said:
It's an incredibly common thing. Here's a five second ai search.
* J. Hector St. John de Crvecoeur "that race now called Americans"; "a new race of men" (1782).
* Thomas Jefferson treated Americans as an Anglo-Saxon-descended people with a distinct New World genealogy and political inheritance.
* Ralph Waldo Emerson predicted that America's mixture of peoples would "construct a new race" (1845).
* Walt Whitman "America is the race of races" (1855); later wrote explicitly of the "average good American race."
* Frederick Jackson Turner described the frontier as producing "a new people, with new social and political types and ideals" and a distinctive American character.
* Henry Cabot Lodge treated the established American population as an ethnic body, contrasting immigrants from "races most alien to the body of the American people."
* Theodore Roosevelt exceptionally explicit: Americans had become "a people by ourselves"; the word American had acquired more than geographical meaning; he called the pioneers "distinctively and intensely American stock."
* Woodrow Wilson wrote of a distinct "American type of man" and later spoke of the "[American] race" being renewed by immigrant stocks.
* Madison Grant referred to the older population as the once-distinct "'American' people" and treated it as a historically formed national stock.
* Robert DeCourcy Ward wrote of the "traditional" native-born American type and the maintenance of a homogeneous American race.
* Albert Johnson treated the existing American population as a particular national/racial stock when shaping the 1924 national-origins immigration system.
* James A. Reed described the melting pot as having produced a "distinctive American type" and spoke explicitly of preserving America's "racial composition."
* Calvin Coolidge spoke in explicitly racial/ethnic terms about preserving an American population type and argued that "biological laws" limited the blending of divergent peoples.
* Lothrop Stoddard wrote that by the mid-19th century there existed "a real American nation inhabited by a well-defined 'American race.'"
* Harry H. Laughlin attempted a formal "definition of the American Race," describing the "racial stock of the American people" as a historically constituted population.
For Anglo Americans
* Stephen F. Austin "the Anglo-American race" (1836): "a war of barbarism and of despotic principles … against civilization and the Anglo-American race."
* Sam Houston spoke of the "Anglo-American race" in Texas; in 1848 described Mexico's objective as the annihilation of "the entire Anglo-American race" there.
* Jedediah Morse "Anglo-Americans" (1789): Americans descended principally from the English were, "for the sake of distinction, … called Anglo-Americans."
* Daniel Webster described Americans as the "Anglo-American" branch of the "English race" and envisioned the continent becoming Anglo-American.
* Herbert Baxter Adams employed the concept of an "Anglo-American race" in his historical account of American institutions and their Germanic/English origins.
* Theodore Roosevelt repeatedly conceived western expansion as the movement of the Anglo-American race, alongside his separate conception of an emergent American race.
* Josiah C. Nott described an "Anglo-American nation" as a distinct racial population within the contemporary ethnological taxonomy.
* Chester Newell described the settlement of Texas as "establishing the Anglo-American race" to the south and west (1838).
* Sam Houston's Texas contemporaries the phrase "Anglo-American race" was also ordinary enough in the Texas expansionist discourse of the 1830s40s to appear in private political correspondence about the westward movement of Americans.
* Late-19th-century American legal and civic writers the president of the American Bar Association in 1893 could refer without explanation to "our Anglo-American race," indicating that the formulation remained conventional elite vocabulary.
Well done set of references by the way....
"A single generation, passed under the hard conditions of life in the wilderness, was enough to weld together into one people the representatives of these numerous and widely different races; and the children of the next generation became indistinguishable from one another. Long before the first Continental Congress assembled, the backwoodsmen, whatever their blood, had become Americans, one in speech, thought, and character… Their iron surroundings made a mould which turned out all alike in the same shape."
Additional quotes: they lost "all remembrance of Europe and all sympathy with things European"
They became "products native to the soil."
The same iron conditions "produced a shared character: self-reliant, freedom-loving, democratic in their little commonwealths, grim, hardy, often violent, and fiercely attached to the land they had taken"
The Winning of the West, Teddy Roosevelt - multivolume series begun in 1889