Snowshoe breeds originated from a breeder who was breeding siamese cats and a litter of kittens all came out with white feet. So the breeder bred the kittens with American Shorthair breed and the result was a new breed called Snowshoe.
They have Siamese feature but have all white paws and some white in the face and/or forehead.
I read the wiki page right after my post. Pretty interesting history. Kind of sounds like Ragdoll history in a way, only without such a confusing beginning, and the cats are very difficult get pattern correct. I love American ingenuity!