South America backs Uruguay-Argentina bid
The CSF announced its support for the initiative in a statement issued after an executive committee meeting on Wednesday at its headquarters in the Paraguayan capital.
Olympic champions Uruguay beat neighbours Argentina 4-2 in the first World Cup final in 1930 at the Centenario stadium in Montevideo.
Next year's World Cup will be held in South Africa, while Brazil will host the 2014 tournament.
FIFA is evaluating bids for the 2018 and 2022 tournaments with a decision due in December 2010.