1000+ year PoD? Differences and Simularities

Let say you take an atl nation from an alternative universe, PoD 1000+, something like this https://alternatehistory.com/forum/threads/furor-celticus-a-gallic-timeline.450352/
Or a Byzantine, of a Viking United Scandinavia or whatever?
But you update to the 21st century. In addition, it goes through many of the events like the conquest of the new world, and industrial revolution, etc, how simular can it be?

1) Lets assume the alt Universe's technology is roughly but not exactly equal to our universe. They are ahead in certain areas behind in others and certain things just developed differently.

For example, could you have a society industrialize entirely by wind and hydro and only use fossil fuels for niches like transportation?

What areas could develop very differently?

2) Lets assume they had similar challenges in exploration, industrialization, philosophical evolution but they didn't always come up with the same solutions. What ideologies will be convergent because similar societies go through simular challenges verses unique to us/them.

For example, hypothetically eugenics doesn't bother an atl society the way it does us because they never had a movement to discredit it to the extent the Nazi's did and their own ideology avoided a lot of the attached racism/social darwanism.
On the other had, because a rising middle class arose in both societies representitive government exists very simularly to our system.

What would be required to be similar due to convergent social evolution and what could be different?

Basically, how alien can a society be and be simular?
 
I've done this a couple of times, once going from medieval to modern+ and once from 19th century to science fiction type future.

Systems of marriage are one thing that can change, especially with globalisation, as people get exposed to the idea of another wife, a secondary wife - these were commons among Europeans who worked in W Africa or India, but had a family back home, or among those in the Wild West who had a family back East but took up a new Indian wife. These things could have become more formalised, with the Bible acting as support, since we see Old Testament figures with primary and secondary wives.

Attitudes to death could be another. Even in the 1960s Formula 1 was a sport whereby there was a reasonable chance of death. Neville Shute's "On The Beach" takes it one further where there is an expectation of deaths per race. This would hark back to jousting and tournaments etc, where the risk of success was dying and where several dead contenders was perfectly normal and acceptable.

Other ideas would be towards euthanasia, how many children you should have, and so on.

I like this idea, but this is all that comes to what I call my mind rn

Best Regards
Grey Wolf
 
I really like this idea. People forget that the rapid conquest of the Americas was by no means guaranteed, and that Alexander the Great was even less so. I once had plans for a TL with a POD 100,000 years ago. Everything can be radically different.

A good way to pace this out is by taking a tiny portion of it. Let's say I drive my *car to a *gas station in a really different world. I park my car and the attendant shovels a few dozen pounds of coal into the engine. I'm bored and have the munchies and walk into this gas station to grab some snacks for the road. I grab a few honeypot ants out of the small colony the store maintains and a small uranium glass bottle of goats milk. I go up to the dude at the counter, check out, and as payment I write down that 3/5ths of a massive rock somewhere in Eastern Sulawesi is now the companies. I get back in my car and get driving down the sandy road. I know this example was a lil bit shit but like just little slice of life stuff is the best for getting these ideas established
 
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