The migration of rural residents to Oklahoma's towns and cities after World War II and through the 1980s and 1990s has reduced populations to such a degree that some villages in
parts of the state have disappeared. ITS C
A northern
В. southern
C. western
D. eastern

i believe that the answer to the question provided above is that  establishing smaller ethnic communities within larger communities  gives more chance for people to know each other more but this might lead to the  conflict between groups.

answer: (fluidity)is the correct answer.

explanation: because of this characteristic, success on the battlefield depends in large part on the ability to adapt to proactively change events to our advantage as well as to react quickly to constantly changing conditions