If a civilization as old as the Sumerians and Egyptians was to arise in the western fringes of the Mediterranean (Portugal, Morocco essentially), how would the Ancient world be changed.
From what I can gather, such a civilization would dominate the trade of tin into the Mediterranean and thus they would likely set up colonies in the British Isles and along the French and Spanish coast to maintain trade routes. They would also likely travel down the African coast due to their maritime nature. How long would it take before they accidentally (or purposely maybe) discover the Americas?
I could imagine the Berbers eventually developing their own kingdoms through the influence of this civilization (assuming it isn't in Morocco).
In summary, how would a civilization in Portugal/Morocco (founded in 4000-3000 BC) affect the rest of the world?