The largest margin of victory in the football world cup finals is by 9 goals.. (Hungary 9-0 South Korea in 1954; Yugoslavia 9-0 Zaire in 1974; Hungary 10-1 El Salvador in 1982)
.... BUT.. the highest margin of victory if you include the qualifying stages is by an amazing 31!! goals.. Australia beat American Samoa 31 - 0 in the qualifying stages for the 2002 World Cup.. Also in that Match an guy called Archie Thompson broke the record for most goals in an international match.. scoring an amazing 13!! times.