To obtain a visa to enter the US would require different requirements based on the type of visa you're looking to receive. To find the exact requirements for visit, study, work, and Immigration visas you can visit the State Travel website that is government operated.
No. Having a visa for the US doesn't grant you the possibility to enter Mexico; you need the corresponding visa from Mexico.
Yes, Brazilians need a visa to travel to Mexico.
Yes, Peruvians need a visa to travel to Mexico.
American citizens don't require a visa to visit Mexico.
No; only diplomatic staff requires a visa to enter Mexico.
Yes, Turkish citizens need a visa to travel to Mexico.
No. Having a visa for country A will never work to get into country B -- anywhere in the world. In the case of Mexico, you need to get a visa issued by the Mexican government.
You need a passport to cross the border into America from Mexico, and a visa (different visa for business or for visiting).
As long as you have a US visa with you, you can also enter Mexico.
No; Latvian nationals don't require a visa to enter Mexico; all they need is their passport.
You need a passport and an entry visa if you are entering Mexico from any country other then the US.
Yes, someone from Mexico can visit the US with a valid visa or through the Visa Waiver Program.