A common feature of alternate histories where the point-of-divergence is far enough back is that a Mayincatec
civilization has somehow survived to the present day, and now rules a large chunk of the Americas.
Like Zeppelins from Another World
, generally done as a throwaway "Look how different this world is" detail, without any serious or detailed consideration of how it happened or what the geopolitical effects were. (Possibly correlated with alternate worlds where the technology level never got high enough for zeppelins.)