The US national team is the best in CONCACAF.
That's what the current CONCACAF Hexagonal standings say with two games remaining, but that's also what the September FIFA World Rankings indicate.
Jurgen Klinsmann moved one place closer to reaching his goal of transforming the USMNT back into a Top 10 team, moving up to 13th in the world, well ahead of rivals Mexico, who dropped to No. 21.
FIFA used the World Rankings to determine the top eight seeds for the 2010 World Cup in South Africa, taking the top seven teams of the October 2009 rankings to determine the group seeds that would join hosts South Africa. In 2006, the formula was a bit more complex (see it here).
As far as the rules for determining the seeds for the 2014 World Cup, FIFA confirmed to MLSsoccer.com that "the final draw procedure will only be determined following the FIFA World Cup Organizing Committee meeting which takes place on 3 December 2013 in Salvador de Bahia." The actual draw takes place three days later on Dec. 6.
Canada are currently listed at No. 106, behind the likes of Guatemala (No. 100), El Salvador (No. 93) and Jamaica (No. 78).