East Rutherford (United States) (AFP) - Argentina and Spain fine-tuned preparations for Sunday's World Cup final in New Jersey as a persistent, choking smog blanketed the eastern United States.Just two games remain out of 104 matches at the 48-team extravaganza, including Saturday's third-place play-off between France and England.Lionel Messi's Argentina are striving to become the first team since Brazil in 1962 to win back-to-back World Cups, while Spain are trying to win a second title after their maiden victory in 2010.US President Donald Trump will be among a crowd of more than 80,000 spectators at the MetLife Stadium in East Rutherford -- the first game he has attended.Mexican Presiden…