What about "monster" races?

Goblinoids and Lizardfolk were common in the West prior to the plague, and they continue to exist there today. Lizardfolk are most common in the southern coastal areas (think Mexico and Central America). Goblinoids are more prevalent in the north.

Orcs were completely wiped out by the plague in the new world, but retained some strongholds in the Old World. Some orc bands began to migrate West as long as 50 years ago or more, especially in the cold northern climates.