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 I Googled "nineteenth century" "American ancestry" and the first result cited the Wikipedia article of ENGLISH AMERICANS:

From the First to the Twelfth census of the United States: 1790–1900 by the Government Census Bureau estimated the English were 83.5%, 6.7% Scottish, 1.6% Irish, 2.0% Dutch, 0.5% French, 5.6% German and 0.1% all others of the white population for the 12 enumerated states. https://en.wikipedia.org/wiki/English_Americans