So as the title asks. I was thinking and it makes sense to me that it happened but couldn't find anything that proves it.
I was thinking how east had thriving economy, but was that thanks to westerners moving to east or just east by itself.
I don't know what more I can say on my part since I am no real historian but I need to have here some more text so that bot moder allowes my post to go through.
9998000 t1_it3466j wrote
I have no facts as I wasn't there, but mass migrations are a relatively modern affair.
Not sure you are going to find a census.