When you conquer foreign provinces, is it possible to encourage the conquered POPs to migrate to your home provinces/states and have them assimilate? Since migrants travel in small numbers, I assume its possible to say, conquer a Chinese province, close the RGO and watch 200k Chinese trickle to the USA and become Yankee. Grab the whole of China and you can have 500 million Yankees by the 1890s.
Would this be possible?