Duocontinental World

So, most of us know there are 7 continents today,  Europe, South America, North America, Asia, Africa, and Antarctica, but what would it be different if there would be only two, which for the sake of simplicity Im gonna just call Uno and Duo, but then lets just start with it, if you want to contribute in the future, feel free to do that

70000:

Two human species exist independently on Uno and Duo, both being a little different, both in culture and intelligence, humans from Duo are the less intelligent with 80 IQ as normal, and people from Uno have a much larger 100 IQ as their normal, but both being smaller than a modern day human

50000:

The 2 humans meet the first time, and a common specimen is created with 125 as the normal IQ, but the other species are not extinct

20000: The Duan human is extinct, but there is still a number of the Unan species

17000: The Unan species merge with the modern human, which has evolved and now has 129,99 IQ as normal

13000: Agriculture is created, but no larger human settlements so far

9000: The Ana culture is born in northwest Uno, most known symbols are the stylized moon, the cave entrance, and a tree

5000: Banners are invented and commonly used in rituals by the Ana, also more cultures emerge like for example the Teapolian culture in south Uno, having similar traditions to real life Christianity, and Thamiont culture on both east and west Duo

3000: The Ana invents a really humble version of writing with a 100 glyphs

1500-1450: The first recorded war happened between the Ana Empire and the Holy Teapolitan Empire, the Ana Empire wins and the Holy Teapolitan Empire falls apart into many smaller nations, most notably Chewig, and Teapoli (formal capital of the empire as a city state)

500: The Teapolitans develop their own writing system based on the Ana one, but with only 70 glyphs and 2 joint-glyphs which are used to show the relations between two glyphs