I actually think hilltop settlements are part of the problem (not the disease problem). Infant civilizations need to get dense, and carrying all your water up the hill is an impediment to that until relatively advanced technology.
Is your thesis that (ATL) agriculture develops independently...
Without a Red victory in Russia, the Nazis probably don't exist as a viable party. Not that something else nasty coming from Germany is unimaginable...
I would imagine in all probability it would be like William Adams and those Dutch who worked for Tokugawa. Hatamoto (minor nobility), descendants fade into obscurity.
The difference, however, is thier jobs. The abovementioned were basically pet Euro-experts valued because they were hostile...
The center would definitely rebound. No doubt
The question is then making any of this land livable. At high latitude, continental east coasts are colder than west coasts. Greenland and Hudson's Bay are especially cold this way. You'd need general global warming and/or a redirection of ocean...
What you really need to pull this off is competing non-Turkish muslim identities. Anatolian Muslims would much quicker grab on a different ethnic identity than change religion.
How exactly you arrange that I don't know.
Alternatively, you make WWI end faster (intact Russia) but still...
I forsee Norse adventurers sailing up the St. Lawrence and down the Atlantic coast. This raiding and trading should have consequences. Where would raiding and trading be profitable? How many wives would be brought back? What's the likely point of first contact with Iroquois or other...
There were technically things Britain could have done to keep India, given fairer winds. However, I just don't see the British -taking- those steps. It's like how Portugal failed to keep Brazil- too much attachment to their original piece of dirt.
A British Commonwealth could easily include...
The greatest level of violence is seen at the agricultural transition through the early bronze age. This can be seen in both paleogenetic evidence and 'fossil' societies. Once you farm, you have to defend your territory instead of shifting away. That isn't to discount the high rates of...