The Manchu are the largest Tungusic ethnic group, but are almost exclusively found in mainland China and Taiwan. Along with their close relative ethnic group, the Xibo, they can be found all across northern China, from Heilongjiang to Hebei to Xinjiang. There aren't many Manchu to be found outside of China, however.
With a POD no earlier than the beginning of the Qing dynasty, make an exodus of Manchu from China that is significant enough to number over one million people or more by the modern day. The larger the diaspora, the better, though it shouldn't take away from the large number of Manchu that remain in China. Which country is most likely - Japan, one of the Koreas, Russia, or somewhere else? Bonus points if this Manchu diaspora manages to maintain its language and culture to much greater degree than the modern Manchu living in China have.
With a POD no earlier than the beginning of the Qing dynasty, make an exodus of Manchu from China that is significant enough to number over one million people or more by the modern day. The larger the diaspora, the better, though it shouldn't take away from the large number of Manchu that remain in China. Which country is most likely - Japan, one of the Koreas, Russia, or somewhere else? Bonus points if this Manchu diaspora manages to maintain its language and culture to much greater degree than the modern Manchu living in China have.