North American Empires

In OTL, Europe had many civilizations. The Greeks and the Romans are just a few. The Europeans later when out to colonize much of the world. In the Americas, Native American tribes existed all over the continents.

But in this timeline, European tribes were never influenced by farming techniques in Anatolia and the Near East, so the majority of the population remains hunter-gatherers. In the Americas, the Neolithic Revolution has a greater effect on the continents, creating civilizations across the continents, and these civilizations would go on to colonize the world.