Need help finding info for essay

I got to compare American football to soccer for Spanish Class(thank god i can write in english). i need three topics. i got "How they came to be", and "how popular they are in their nation". i need to know what % of mexicans watch soccer and i need a third topic... any help?

i have googled, nothing useful.

well if you need help i can write stuff for you in spanish and just look it up in google if you wan the questions in spanish here they are,
"How they came to be"===== Como se hicieron.

"how popular they are in their nation"===== Que tan popular son en su pais

need to know what % of mexicans watch soccer====
Cuanto porsiento de la poblacion de mexico ve el football.