Quote Originally Posted by GameRant
Red Dead Online players are calling for developer Rockstar Games to add a new map region in Mexico to the Wild West multiplayer title. (...) This has led to some players calling for Mexico to be added to Red Dead Online. As tall of an order as it may seem, Rockstar Games' other online title Grand Theft Auto Online recently received a new location as part of its Cayo Perico Heist update, so it is not beyond reason for Red Dead Online players to hope for something similar. The newest call for the update comes from Red Dead Online's subreddit, where many players are discussing what such an update could all mean for the title.

Many fans are quick to point out that Mexico was already a location in the first Red Dead Redemption, making players eager to return to the area and see how it looks in the new time period. Other fans have raised complaints that there is not enough to do in the game's map as it is, so they claim that adding a new region won't bring enough to the game without updates to add more to do across the entire game. Many other fans expressing their hope that if Mexico is added to the game that it be added to Red Dead Redemption 2's single-player mode as well so that the title does not go without single-player DLC as Grand Theft Auto 5 has.

While Rockstar Games has yet to comment on whether or not players can expect to visit Mexico, there is some evidence pointing to the region coming in the future. Recently, a Red Dead Online player was mistakenly spawned in a Mexico region, so it is possible that the developers are currently developing the area and filling it with missions, animals, and towns for players to visit. If there is something in the works, hopefully, Red Dead Online players will get some official news on it sooner rather than later.
Red Dead Online Players Are Calling for Mexico DLC