Why is Menghualu Liu Yifei an American nationality?

1. Liu Yifei's American nationality in "Menghualu" was because she immigrated to the United States with her mother when she was a child. She became an American citizen for the convenience of studying.

2. At that time, China did not allow dual citizenship, and for some reasons she chose American citizenship.

3. The issue of Liu Yifei’s nationality has been mentioned a long time ago, and this is nothing new.