

It’s only really the hyper developed countries that are experiencing the massive drop off in birth rates, so immigration would actually help this problem significantly.
Also, the lack of immigration in Japan is as much a matter of policy as it is everywhere else. Their government heavily discourages migrant labour (due in part to cultural racism), which has made their plummeting birth rate much more of a problem than it needs to be.




The Eastern Roman Empire was every bit as Roman as the Western Empire.
At the point when the empire split in two the capital had already been moved to Constantinople, so if anything it’s the Western Empire that was the pretender (though that is also a stupid take, both empires were clearly roman, unlike the much later HRE).