I think the cavalry should be only recruited in the Caribbean at the very least. I mean the last thinh we want to see is hordes of cavalry swarming around in Mexico. When you look into the history of the battles with the Aztecs, Incas and other indigenous peoples of the Americas, the Spanish had only limited numbers of cavalry availiable. I don't mind dismounted units being trained but not loads of horsemen, the Indians peoples will get destroyed in a few turns of the European armies landing which isn't great for gameplay