According to Rockstar Games veteran Lazlow Jones

In an interview with Kinda Funny Games, Lazlow reminisced that if the team “needed specific accents or languages, we’d travel to those places.” For Red Dead Redemption 2, that meant jetting off to Santa Fe, New Mexico to record with Native American communities, or traveling to New Orleans to work with Creole individuals because “those accents you just can’t get right with New York, LA actors.”