One Direction are an English-Irish pop boy band based in London, composed of Niall Horan, Liam Payne, Harry Styles and Louis Tomlinson; former member Zayn Malik departed from the group in 2015.
Decade by decade, sort and rank (probably) by decade OF ONLY THEIR FIRST ALBUM DEBUT (e.g. Madonna had her first album in 1983 so she goes into 1980s category)
