If Rome never rises, Early on the Mediterranean is dominated by Carthage and Greeks. Genghis Khan sweeps in taking Europe since it consists mainly of tribal kingdoms which didn't grow into empires. After the dust settles and widespread revolts tear the Mongolian Empire apart in Europe, it's still divided and relatively un-advanced. Carthage still dominates much of the Mediterranean to this day. America isn't invaded by Europeans. Instead trade is established by Saxons. Who after realizing raiding isn't profitable use their sailing skills to become the "Venetians" of the northern seas. The native tribes in America develop metal working, thanks to the Saxons. And build their own empires which last to this day as world powers, alongside China, Carthage, India, And Mongolia which consists of modern day Russia and pushes down to the border of Afghanistan.