According to the National Migration Institute of Mexico, these countries require a visa to travel to Mexico: http://www.inm.gob.mx/gobmx/word/index.php/paises-requieren-visa-para-mexico/.
These countries do not need a visa to travel to Mexico: http://www.inm.gob.mx/gobmx/word/index.php/paises-no-requieren-visa-para-mexico/