Very interesting question, UDog, and I'd bet no one has the exact answer. I've wondered many times how the first humans made those first steps toward the development of "technology", primitive though they might have been. Even an individual's imagination had no existing frame of reference. Nothing seemed possible because nothing had been done.
Think of all the simple devices and processes that we take for granted, e.g., a hammer and a nail. A sharp cutting edge. A length of rope. Even the fabric in our clothes.
When fire was recognized as a "tool", firewood was limited to the dead wood already on the ground. There was no way to cut a new supply. Metal, if found in a raw form, had to be used in that raw form because of no way to melt it, nothing to melt it in. Even cooking was limited to holding something over a fire with a stick. How you gonna boil water to make a stew?
I don't know if I'm making any sense here, but back to your original question, why not here? The answer may be that the native Americans simply never stumbled into those first revolutionary processes that opened the way for successive developments. In those parts of the world where those developments did happen, it may have been the result of nothing more than a series of fortuitous happenstances. In other words, just plain dumb luck.
But what do I know?