If it took humans so long to get to America from Asia, it seems plausible that they were confined to the Pacific coast for a long time as well, but high rates o

If it took humans so long to get to America from Asia, it seems plausible that they were confined to the Pacific coast for a long time as well, but high rates of erosion and seismic activity could easily destroy the evidence. It's certainly counterintuitive that the first place people colonize would be the semiarid high plains of New Mexico! The easiest places to cross the American Cordillera are in southern Mexico (Chivela Pass), Nicaragua (San Juan River) and Panama. But these places are also very rainy.