United States of America
Even though the Grand Theft Auto video games are made in the United Kingdom, they are released first in the United States of America, and subsequently Canada. The success of the video game series is the fact that is based solely on American popular culture. The music, the clothes, the slang, and the abundance of vehicles in the game are considerably of American origin.
If the entire Grand Theft Auto world was place in an atlas, then the state of San Andreas (with its cities San Fierro, Los Santos, and Las Venturas) would be the westernmost part of the atlas, Liberty City, Vice City, and Carcer City would be in the geographical centre and London would be considered to the eastermost part of the atlas, even though they are cities in the United Kingdom in real life that are either north and/or east of London, England.