Avoid the Sinization of Manchuria

What are the best ways to avoid the assimilation of the Manchu to Han Chinese? Preferably after the Qing conquest.

How huge would the consequences be? Would Manchuria remain under Chinese rule/enter in Chinese rule? Or would the Russians and Japanese prevent that.
 
Isn't the Sinicisation of Manchuria more to do with the region being opened to settlement by ethnic Han Chinese, though?

Granted, I don't know all that much about this period. :oops:
 
I guess the real question is why the qing didn't adopt modern agricultural techniques to Manchuria. Despite controlling all of China for over a century their Homeland (outside of mostly-han liaodong) had only a couple million people and many of them were still pre-agricultural. China-proper's population had risen greatly due to new crops and techniques from the Columbian exchange, so it's no wonder that as soon as the qing opened the fertile plains of Manchuria to settlement han outnumbered Manchu almost instantly.

So by 1800 or so the Manchu are probably doomed.
 
A possibility is that the Manchus before the conquest could have unified and simply developed their own independent Jurchen/Manchu state. From which they could develop the necessary measures to resist sinofication
 
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