Because LS is in the state of San Andreas. San Andreas is R*'s version of California.
On the Trailer the sign said Los Puarta. Could Puarta be R*'s Version of the word Puerto? Looking at a map of Cali, the nearest Puerto is, Puerto PeƱasco, Mexico. Could we see a little bit of over the border like RDR?
Puerta means door.
Can you say puerta? Say puerta, puerta, puerta, FUCKING PUERTA!! SAY IT BITCH!