Red Dead Redemption 2 Mexico Can Be Explored Through A Glitch
https://wccftech.com/red-dead-redemption-2-mexico/
Red Dead Redemption 2 includes most of the Red Dead Redemption map, with the exception of Mexico, which cannot be explored normally. Thanks to a glitch, however, it’s possible to see what lurks out of bounds.
The glitch, which is detailed in the video below, allows players to get into Mexico and explore some of it. Most of the area is empty, but the few placeholder buildings seem to suggest that the area may be completed down the line.