fernando alonso won the 2004 world championship.
The 1951 Formula One championship was won by Juan Fangio - (Argentina).
No one till now has won a World Championship in their Debut
The 1950 Formula One championship was won by Emilio Giuseppe "Nino" Farina - (Italy).
Lewis Hamilton won his first world championship in 2008, and has since won in 2014 and 2015.
Tommi Mäkinen
Alberto Ascari who won the championship that year was born in Italy
Mike Hawthron who won the championship that year was born in England
Jack Brabham who won the championship that year was born in Australia
Phil Hill who won the championship that year was born in America
Graham Hill who won the championship that year was born in England
Jim Clark who won the championship that year was born in England