In the United States, the mixing of immigrant cultures produced new forms of dance, such as tap dancing. Before the Frist World War, new ballroom dances came to Europe and America, for example,the Tango and the Cha-Cha. The Argentine Tango was made internationally popular by Carlos Gardel, through his songs and films. After the Second World War, African-American rhythm and movements became part of popular social dance. Rock'n'roll dances were popular during the 1950s. In the 1960s,people danced without touching their partner. Dancing in couples returned in the 1970s and 1980s with "disco"music. In the mid-1980s,breakdancing became popular. This form of dancing is almost like acrobatics. It began in their poorer parts of large American cities.