“I have not one drop of blood in my veins but what is American.”
To an ambassador (1785), as quoted in The Works of John Adams, Second President of the United States: Autobiography http://books.google.com/books?id=lWcsAAAAIAAJ&pg=PA392 (1851), by Charles F. Adams, p. 392.
1780s
Context: Neither my father or mother, grandfather or grandmother, great grandfather or great grandmother, nor any other relation that I know of, or care a farthing for, has been in England these one hundred and fifty years; so that you see I have not one drop of blood in my veins but what is American.
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John Adams 202
2nd President of the United States 1735–1826Related quotes

Speech in Dundee (29 October 1890), quoted in The Times (30 october 1890), p. 4
1890s

“The love of liberty is a common blood that flows in our American veins.”
Presidency (1977–1981), Farewell Address (1981)
Context: I have just been talking about forces of potential destruction that mankind has developed, and how we might control them. It is equally important that we remember the beneficial forces that we have evolved over the ages, and how to hold fast to them.
One of those constructive forces is enhancement of individual human freedoms through the strengthening of democracy, and the fight against deprivation, torture, terrorism and the persecution of people throughout the world. The struggle for human rights overrides all differences of color, nation or language.
Those who hunger for freedom, who thirst for human dignity, and who suffer for the sake of justice — they are the patriots of this cause.
I believe with all my heart that America must always stand for these basic human rights — at home and abroad. That is both our history and our destiny.
America did not invent human rights. In a very real sense, it is the other way round. Human rights invented America.
Ours was the first nation in the history of the world to be founded explicitly on such an idea. Our social and political progress has been based on one fundamental principle — the value and importance of the individual. The fundamental force that unites us is not kinship or place of origin or religious preference. The love of liberty is a common blood that flows in our American veins.

“I have Russian, German, Spanish, Italian, French and Ethiopian blood in my veins.”
As quoted in TIME magazine obituary, (5 April 2004) http://www.time.com/time/magazine/article/0,9171,501040412-607849,00.html, p. 22, which noted that his great-grandfather had married the Princess of Ethiopia.

“The blood of three oppressed races runs in my veins.”
As quoted in [Paul Lafargue and the Founding of French Marxism, 1842-1882, Derfler, Leslie, Harvard University Press, 1991, 11, https://books.google.com/books?id=L_E_OR6owEEC&pg=PA11]

“Madam, you have bereft me of all words,
Only my blood speaks to you in my veins”
Source: The Merchant of Venice

“There is blood in my veins
That has run clear of the stain
Contracted in so many loins.”
"Here"
Tares (1961)