Ameraucanas were bred from chickens imported from Peru. The APA officially accepted Ameraucana as a breed in 1984.
The characteristic muff and beard of the Ameraucana are present in U.K. Araucana as these traits are present in the Mapuche and Quechua de Artes founder stock imported into Europe from the Falkland Islands. The fully feathered faces of the founder stock are of vital importance as they insulate the birds against the frigid cold of southern coastal South America. Winds from Antarctica bring the temperatures to below zero for months at a time. Blue egg laying chickens brought to the Falklands by Argentinians, traded from Mapuche and Quechua speaking Indians, were later exported from the Falkland Islands by British guano and fishing fleets. The Ameraucana is descended of U.K. Araucanas brought into North America during the World Fair in Montreal's 1967 Expo. Molecular data retrieved from specimens of known provenance in the Falklands, U.K., Shetland Isles and Canada, proved to be closely related. Consequently, the Ameraucana is probably closer genetically to the South American founders than the North American Araucana. In about 1976 a group of people imported some Chilean Araucanas. At least one of these people kept his flock breeding only among themselves. Chicks from their blue eggs looked similar to the British tailed Araucanas and the Ameraucanas, however most do not meet the standards of true breeds.