Football in England - Wikipedia
List of Super Bowl champions, Packers Wiki
Early history of American football - Wikipedia
List of NFL champions (1920–1969) - Wikipedia
Cyprus national football team - Wikipedia
College football national champions by year from 1869 to today
Indonesia national football team - Wikipedia
Brazil national football team - Wikiwand
Sweden men's national football team - Wikipedia
List of National Football League champions, Packers Wiki
Which football teams have won the treble?