Throughout the 20th century, national borders were often redrawn to be based (more-or-less) on ethnic lines. Overall, this is especially evident in various parts of Europe as well as throughout the former Soviet Union.
Anyway, what I am curious about is if there is a realistic way to have even more national delimitation worldwide. Also, it would be extremely strongly preferable for this to be done without any ethnic cleansing and/or genocide; thus, things such as large-scale expulsions and whatnot should certainly be avoided at all costs!
Any thoughts on how to achieve more national delimitation worldwide?