AMERICAN TANGO  

American style tango’s evolutionary path is derived from Argentina to U.S., when it was popularized by silent film star Rudolph Valentino in 1921, who demonstrated a highly stylized form of Argentine tango in The Four Horsemen of the Apocalypse. As a result, the Hollywood style steps mixed in with other social dance steps of the times began this branch away from the Argentine style. Meanwhile, the tango was also making its own inroads into Europe.
Following the English standardization of their version of Tango, Arthur Murray, a ballroom dance instructor in the U.S., tried his own hand at standardizing the ballroom dances for instruction in his chain of social dance schools.  Consequently, his tango syllabus incorporated steps with Argentine, Hollywood and socially popular influences and techniques. This looser social style was referred to as American style by the English.