“…The decline in monoethnicity was driven especially by internal migration from diverse monoethnic locations to urban centers, and by the disappearance of small villages as the young migrated to cities and the older generation died. To some extent this trend was offset at the higher level geographical units, since migrants to the cities tended to stay within territories dominated by their own ethnicity -Serbs in Serbia tended to relocate within Serbia, and so on (Hoffman 1973, Sharp 1975, Thomas 1979.…”