I feel it’s like asking how are these ancient gigantic moving stone contraptions functioning when you encounter them hundreds or thousands of years after they were built in video games or adventure movies. Don’t have a cow man.

Not exactly the same premise that you described, but just a first reaction on the title is try Final Fantasy X. It’s certainly got time travel elements as well as amnesia!

Thank you. Now I’ll be thinking about the relative importance of this measurement vs per capita measurements in different contexts.

“…the ongoing eastward and southward shift of the world’s economic and political centre of gravity.”

Citation needed