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The authentic tango dance and music originated in the area of the Rio de la Plata, and spread to the rest of the world soon after.
The "milonguero" style is characterized by a very close embrace, small steps, and syncopated rhythmic footwork. It is based on the petitero or caquero style of the crowded downtown clubs of the '50s.
In contrast, the tango that originated in the family clubs of the suburban neighborhoods (Villa Urquiza/Devoto/Avellaneda etc.) emphasizes long elegant steps, and complex figures. In this case the embrace may be allowed to open briefly, to permit execution of the complicated footwork.
In 2009, Argentina and Uruguay suggested the Tango to be declared a world heritage of humanity, in October of the same year UNESCO approved it.