An Englishman or a Frenchman, if asked about his origin, would never think of saying, "I am a European"; but from the lips of an Argentine or a Colombian the words Soy Americano fall quite naturally, with the addition Colombiano or Argentino.
"South America and the War"
F. A. Kirkpatrick
In the electoral campaign of 1880 the presidential candidates were Julio Argentino Roca and the Governor of the province of Buenos Aires.
"The Hispanic Nations of the New World Volume 50 in The Chronicles Of America Series"
William R. Shepherd
In all the years they'd worked together at the Instituto Argentino de Ciencia Fisica, that had been unmentioned between them.
"The Answer"
Henry Beam Piper