Smarter? 

In Mexico, 34% of adults aged 25-64 have completed upper secondary education, much lower than the OECD average of 76% and the lowest rates across OECD countries.

Compare that with Mississippi, one of the least educated US states with a HS graduation rate of 80%.

Mexicans are some of the least educated people in the world. 

Sorry, but those are just facts. Not trying to be uncivil.