They have played each other 34 times and it is called football not 'soccer' thank you.
32 soccer teams
I think it was 14 times.
2010 will be their second appearance.
Officially there are no proves of football in ancient times....
Two: 1999 and 2011 (both times eliminated in the group stage).
Millions. Soccer is a big deal for Mexicans.
1 billion people played soccer in 2000
207 countries play soccer