What was the Swedish group ABBA's only number one hit in the United States?

"Dancing Queen" is a Europop song by the Swedish group ABBA, released as the lead single from their fourth studio album, Arrival. It was written by Benny Andersson, Björn Ulvaeus and Stig Anderson. Andersson and Ulvaeus also produced the song. "Dancing Queen" was released as a single in Sweden on 15 August 1976, followed by a UK release and the rest of Europe a few days later. It was a worldwide hit. It became ABBA's only number one hit in the United States, and topped the charts in Australia, Canada, the Netherlands, Belgium, Ireland, Mexico, New Zealand, Norway, South Africa, Spain, Sweden, the United Kingdom, Germany and Rhodesia. "Dancing Queen" also reached the top five in many other countries.

ABBA are a Swedish pop group formed in Stockholm in 1972 by Agnetha Fältskog, Björn Ulvaeus, Benny Andersson, and Anni-Frid Lyngstad. The group's name is an acronym of the first letters of their first names arranged as a palindrome. One of the most popular and successful musical groups of all time, they became one of the best-selling music acts in the history of popular music, topping the charts worldwide from 1974 to 1983, and in 2021.