Rhodesia gained its independence in 1980 as the nation of:

A referendum was thus held in November 1964, where 56 percent of the Rhodesiansvoted for independence from Britain. On November 11 1965 Ian Smith's regime declared their Unilateral Declaration of Independence. Rhodesia was now an independent state.

Cultural convergence is the theory that two cultures will be more and more like each other a very notable example of this is around the u.s.-mexico border, where 

Bwould be my guess |-/